28355940 has 48 divisors (see below), whose sum is σ = 88220160. Its totient is φ = 7561440.

The previous prime is 28355897. The next prime is 28355953. The reversal of 28355940 is 4955382.

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 = 28355895 and 28355904.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25716 + ... + 26795.

It is an arithmetic number, because the mean of its divisors is an integer number (1837920).

Almost surely, 2^28355940 is an apocalyptic number.

28355940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28355940 is an abundant number, since it is smaller than the sum of its proper divisors (59864220).

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

28355940 is a wasteful number, since it uses less digits than its factorization.

28355940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52529 (or 52521 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 28355940 is about 5325.0295773826. The cubic root of 28355940 is about 304.9402014810.

The spelling of 28355940 in words is "twenty-eight million, three hundred fifty-five thousand, nine hundred forty".