28634720 has 48 divisors (see below), whose sum is σ = 68076288. Its totient is φ = 11381760.

The previous prime is 28634717. The next prime is 28634737. The reversal of 28634720 is 2743682.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 30092 + ... + 31028.

It is an arithmetic number, because the mean of its divisors is an integer number (1418256).

Almost surely, 2^28634720 is an apocalyptic number.

28634720 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 28634720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34038144).

28634720 is an abundant number, since it is smaller than the sum of its proper divisors (39441568).

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

28634720 is a wasteful number, since it uses less digits than its factorization.

28634720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143 (or 1135 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 28634720 is about 5351.1419342043. The cubic root of 28634720 is about 305.9362790410.

The spelling of 28634720 in words is "twenty-eight million, six hundred thirty-four thousand, seven hundred twenty".