28862640 has 60 divisors (see below), whose sum is σ = 96932784. Its totient is φ = 7696512.

The previous prime is 28862609. The next prime is 28862663. The reversal of 28862640 is 4626882.

28862640 is a `hidden beast` number, since 2 + 8 + 8 + 6 + 2 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (60).

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 = 28862595 and 28862604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19324 + ... + 20763.

Almost surely, 2^28862640 is an apocalyptic number.

28862640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28862640 is an abundant number, since it is smaller than the sum of its proper divisors (68070144).

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

28862640 is a wasteful number, since it uses less digits than its factorization.

28862640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40106 (or 40097 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 28862640 is about 5372.3961134674. The cubic root of 28862640 is about 306.7458417707.

The spelling of 28862640 in words is "twenty-eight million, eight hundred sixty-two thousand, six hundred forty".