61642690 has 16 divisors (see below), whose sum is σ = 114783480. Its totient is φ = 23806720.

The previous prime is 61642649. The next prime is 61642717. The reversal of 61642690 is 9624616.

It can be written as a sum of positive squares in 4 ways, for example, as 60668521 + 974169 = 7789^2 + 987^2 .

It is a super-2 number, since 2×61642690² = 7599642460872200, which contains 22 as substring.

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, 105991 + ... + 106570.

Almost surely, 2^61642690 is an apocalyptic number.

61642690 is a deficient number, since it is larger than the sum of its proper divisors (53140790).

61642690 is a wasteful number, since it uses less digits than its factorization.

61642690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212597.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 61642690 is about 7851.2858819432. The cubic root of 61642690 is about 395.0273761937.

The spelling of 61642690 in words is "sixty-one million, six hundred forty-two thousand, six hundred ninety".