28635240 has 32 divisors (see below), whose sum is σ = 85906080. Its totient is φ = 7636032.

The previous prime is 28635137. The next prime is 28635283. The reversal of 28635240 is 4253682.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 28635198 and 28635207.

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, 119194 + ... + 119433.

It is an arithmetic number, because the mean of its divisors is an integer number (2684565).

Almost surely, 2^28635240 is an apocalyptic number.

28635240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28635240 is an abundant number, since it is smaller than the sum of its proper divisors (57270840).

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

28635240 is a wasteful number, since it uses less digits than its factorization.

28635240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238641 (or 238637 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 28635240 is about 5351.1905217437. The cubic root of 28635240 is about 305.9381309409.

The spelling of 28635240 in words is "twenty-eight million, six hundred thirty-five thousand, two hundred forty".