28955780 has 24 divisors (see below), whose sum is σ = 69494208. Its totient is φ = 9927648.

The previous prime is 28955737. The next prime is 28955819. The reversal of 28955780 is 8755982.

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, 103274 + ... + 103553.

It is an arithmetic number, because the mean of its divisors is an integer number (2895592).

Almost surely, 2^28955780 is an apocalyptic number.

28955780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28955780 is an abundant number, since it is smaller than the sum of its proper divisors (40538428).

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

28955780 is a wasteful number, since it uses less digits than its factorization.

28955780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206843 (or 206841 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 28955780 is about 5381.0575168827. The cubic root of 28955780 is about 307.0754446814.

The spelling of 28955780 in words is "twenty-eight million, nine hundred fifty-five thousand, seven hundred eighty".