28351940 has 12 divisors (see below), whose sum is σ = 59539116. Its totient is φ = 11340768.

The previous prime is 28351927. The next prime is 28351943. The reversal of 28351940 is 4915382.

It can be written as a sum of positive squares in 2 ways, for example, as 19219456 + 9132484 = 4384^2 + 3022^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28351897 and 28351906.

It is not an unprimeable number, because it can be changed into a prime (28351943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 708779 + ... + 708818.

It is an arithmetic number, because the mean of its divisors is an integer number (4961593).

Almost surely, 2^28351940 is an apocalyptic number.

28351940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28351940 is an abundant number, since it is smaller than the sum of its proper divisors (31187176).

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

28351940 is a wasteful number, since it uses less digits than its factorization.

28351940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417606 (or 1417604 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 28351940 is about 5324.6539793680. The cubic root of 28351940 is about 304.9258621201.

The spelling of 28351940 in words is "twenty-eight million, three hundred fifty-one thousand, nine hundred forty".