61620490 has 16 divisors (see below), whose sum is σ = 111316680. Its totient is φ = 24559360.

The previous prime is 61620469. The next prime is 61620497. The reversal of 61620490 is 9402616.

It can be written as a sum of positive squares in 4 ways, for example, as 61606801 + 13689 = 7849^2 + 117^2 .

It is not an unprimeable number, because it can be changed into a prime (61620497) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8155 + ... + 13774.

Almost surely, 2^61620490 is an apocalyptic number.

61620490 is a deficient number, since it is larger than the sum of its proper divisors (49696190).

61620490 is a wasteful number, since it uses less digits than its factorization.

61620490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22217.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 61620490 is about 7849.8719734783. The cubic root of 61620490 is about 394.9799487765.

The spelling of 61620490 in words is "sixty-one million, six hundred twenty thousand, four hundred ninety".