61979090 has 16 divisors (see below), whose sum is σ = 115409880. Its totient is φ = 23936640.

The previous prime is 61979077. The next prime is 61979143. The reversal of 61979090 is 9097916.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 34845409 + 27133681 = 5903^2 + 5209^2 .

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, 106571 + ... + 107150.

Almost surely, 2^61979090 is an apocalyptic number.

61979090 is a deficient number, since it is larger than the sum of its proper divisors (53430790).

61979090 is a wasteful number, since it uses less digits than its factorization.

61979090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213757.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 61979090 is about 7872.6799757135. The cubic root of 61979090 is about 395.7446616029.

The spelling of 61979090 in words is "sixty-one million, nine hundred seventy-nine thousand, ninety".