61404978 has 16 divisors (see below), whose sum is σ = 126129600. Its totient is φ = 19915056.

The previous prime is 61404953. The next prime is 61404997. The reversal of 61404978 is 87940416.

It is a happy number.

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, 138078 + ... + 138521.

It is an arithmetic number, because the mean of its divisors is an integer number (7883100).

Almost surely, 2^61404978 is an apocalyptic number.

61404978 is an abundant number, since it is smaller than the sum of its proper divisors (64724622).

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

61404978 is a wasteful number, since it uses less digits than its factorization.

61404978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276641.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 61404978 is about 7836.1328472659. The cubic root of 61404978 is about 394.5189422265.

The spelling of 61404978 in words is "sixty-one million, four hundred four thousand, nine hundred seventy-eight".