28501956 has 144 divisors (see below), whose sum is σ = 88058880. Its totient is φ = 7892640.

The previous prime is 28501943. The next prime is 28501961. The reversal of 28501956 is 65910582.

It is a happy number.

It is a super-2 number, since 2×28501956² = 1624722991651872, which contains 22 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 28501956.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 401401 + ... + 401471.

It is an arithmetic number, because the mean of its divisors is an integer number (611520).

Almost surely, 2^28501956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28501956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44029440).

28501956 is an abundant number, since it is smaller than the sum of its proper divisors (59556924).

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

28501956 is a wasteful number, since it uses less digits than its factorization.

28501956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 28501956 is about 5338.7223190572. The cubic root of 28501956 is about 305.4627250245.

The spelling of 28501956 in words is "twenty-eight million, five hundred one thousand, nine hundred fifty-six".