28437978 has 16 divisors (see below), whose sum is σ = 58413600. Its totient is φ = 9223056.

The previous prime is 28437977. The next prime is 28437979. The reversal of 28437978 is 87973482.

It is an interprime number because it is at equal distance from previous prime (28437977) and next prime (28437979).

It is not an unprimeable number, because it can be changed into a prime (28437977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63828 + ... + 64271.

It is an arithmetic number, because the mean of its divisors is an integer number (3650850).

Almost surely, 2^28437978 is an apocalyptic number.

28437978 is an abundant number, since it is smaller than the sum of its proper divisors (29975622).

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

28437978 is a wasteful number, since it uses less digits than its factorization.

28437978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128141.

The product of its digits is 677376, while the sum is 48.

The square root of 28437978 is about 5332.7270697083. The cubic root of 28437978 is about 305.2339976224.

The spelling of 28437978 in words is "twenty-eight million, four hundred thirty-seven thousand, nine hundred seventy-eight".