40978728 has 48 divisors (see below), whose sum is σ = 126840480. Its totient is φ = 11708064.

The previous prime is 40978697. The next prime is 40978739. The reversal of 40978728 is 82787904.

It is a super-2 number, since 2×40978728² = 3358512296995968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40150 + ... + 41157.

It is an arithmetic number, because the mean of its divisors is an integer number (2642510).

Almost surely, 2^40978728 is an apocalyptic number.

It is an amenable number.

40978728 is an abundant number, since it is smaller than the sum of its proper divisors (85861752).

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

40978728 is a wasteful number, since it uses less digits than its factorization.

40978728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81326 (or 81319 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 40978728 is about 6401.4629577933. The cubic root of 40978728 is about 344.7620791877.

The spelling of 40978728 in words is "forty million, nine hundred seventy-eight thousand, seven hundred twenty-eight".