61275978 has 12 divisors (see below), whose sum is σ = 132764658. Its totient is φ = 20425320.

The previous prime is 61275961. The next prime is 61276021. The reversal of 61275978 is 87957216.

It can be written as a sum of positive squares in only one way, i.e., 31102929 + 30173049 = 5577^2 + 5493^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1702093 + ... + 1702128.

Almost surely, 2^61275978 is an apocalyptic number.

61275978 is an abundant number, since it is smaller than the sum of its proper divisors (71488680).

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

61275978 is a wasteful number, since it uses less digits than its factorization.

61275978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3404229 (or 3404226 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 61275978 is about 7827.8974188475. The cubic root of 61275978 is about 394.2424791687.

The spelling of 61275978 in words is "sixty-one million, two hundred seventy-five thousand, nine hundred seventy-eight".