61390857 has 16 divisors (see below), whose sum is σ = 90812160. Its totient is φ = 36574800.

The previous prime is 61390829. The next prime is 61390873. The reversal of 61390857 is 75809316.

It is not a de Polignac number, because 61390857 - 2⁶ = 61390793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61390897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13819 + ... + 17712.

It is an arithmetic number, because the mean of its divisors is an integer number (5675760).

Almost surely, 2^61390857 is an apocalyptic number.

It is an amenable number.

61390857 is a deficient number, since it is larger than the sum of its proper divisors (29421303).

61390857 is a wasteful number, since it uses less digits than its factorization.

61390857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31604.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 61390857 is about 7835.2317770440. The cubic root of 61390857 is about 394.4886980494.

The spelling of 61390857 in words is "sixty-one million, three hundred ninety thousand, eight hundred fifty-seven".