61865690 has 16 divisors (see below), whose sum is σ = 112769280. Its totient is φ = 24432720.

The previous prime is 61865659. The next prime is 61865707. The reversal of 61865690 is 9656816.

It is a super-2 number, since 2×61865690² = 7654727198352200, which contains 22 as substring.

It is a Curzon number.

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, 38366 + ... + 39945.

It is an arithmetic number, because the mean of its divisors is an integer number (7048080).

Almost surely, 2^61865690 is an apocalyptic number.

61865690 is a deficient number, since it is larger than the sum of its proper divisors (50903590).

61865690 is a wasteful number, since it uses less digits than its factorization.

61865690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78397.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 61865690 is about 7865.4745565668. The cubic root of 61865690 is about 395.5031562690.

The spelling of 61865690 in words is "sixty-one million, eight hundred sixty-five thousand, six hundred ninety".