28922940 has 96 divisors (see below), whose sum is σ = 94752000. Its totient is φ = 7304256.

The previous prime is 28922923. The next prime is 28922941. The reversal of 28922940 is 4922982.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 28922895 and 28922904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28922941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8851 + ... + 11669.

It is an arithmetic number, because the mean of its divisors is an integer number (987000).

Almost surely, 2^28922940 is an apocalyptic number.

28922940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28922940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47376000).

28922940 is an abundant number, since it is smaller than the sum of its proper divisors (65829060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28922940 is a wasteful number, since it uses less digits than its factorization.

28922940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856 (or 2848 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 28922940 is about 5378.0052063939. The cubic root of 28922940 is about 306.9593115941.

It can be divided in two parts, 2892 and 2940, that added together give a cube (5832 = 18³).

The spelling of 28922940 in words is "twenty-eight million, nine hundred twenty-two thousand, nine hundred forty".