28651940 has 24 divisors (see below), whose sum is σ = 60443712. Its totient is φ = 11408480.

The previous prime is 28651939. The next prime is 28651963. The reversal of 28651940 is 4915682.

It is a self number, because there is not a number n which added to its sum of digits gives 28651940.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1385 + ... + 7695.

It is an arithmetic number, because the mean of its divisors is an integer number (2518488).

Almost surely, 2^28651940 is an apocalyptic number.

28651940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28651940 is an abundant number, since it is smaller than the sum of its proper divisors (31791772).

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

28651940 is a wasteful number, since it uses less digits than its factorization.

28651940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6547 (or 6545 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 28651940 is about 5352.7506947363. The cubic root of 28651940 is about 305.9975934992.

The spelling of 28651940 in words is "twenty-eight million, six hundred fifty-one thousand, nine hundred forty".