61377978 has 32 divisors (see below), whose sum is σ = 127785600. Its totient is φ = 19630016.

The previous prime is 61377947. The next prime is 61377983. The reversal of 61377978 is 87977316.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29083 + ... + 31121.

It is an arithmetic number, because the mean of its divisors is an integer number (3993300).

Almost surely, 2^61377978 is an apocalyptic number.

61377978 is an abundant number, since it is smaller than the sum of its proper divisors (66407622).

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

61377978 is a wasteful number, since it uses less digits than its factorization.

61377978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2246.

The product of its digits is 444528, while the sum is 48.

The square root of 61377978 is about 7834.4098692882. The cubic root of 61377978 is about 394.4611099279.

The spelling of 61377978 in words is "sixty-one million, three hundred seventy-seven thousand, nine hundred seventy-eight".