61320978 has 24 divisors (see below), whose sum is σ = 133544268. Its totient is φ = 20335392.

The previous prime is 61320977. The next prime is 61320983. The reversal of 61320978 is 87902316.

It can be written as a sum of positive squares in 2 ways, for example, as 61261929 + 59049 = 7827^2 + 243^2 .

It is not an unprimeable number, because it can be changed into a prime (61320977) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5101 + ... + 12192.

Almost surely, 2^61320978 is an apocalyptic number.

61320978 is an abundant number, since it is smaller than the sum of its proper divisors (72223290).

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

61320978 is a wasteful number, since it uses less digits than its factorization.

61320978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17498 (or 17495 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 61320978 is about 7830.7712263863. The cubic root of 61320978 is about 394.3389638002.

The spelling of 61320978 in words is "sixty-one million, three hundred twenty thousand, nine hundred seventy-eight".