61609375 has 14 divisors (see below), whose sum is σ = 77030264. Its totient is φ = 49275000.

The previous prime is 61609363. The next prime is 61609397. The reversal of 61609375 is 57390616.

It is not a de Polignac number, because 61609375 - 2⁹ = 61608863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 13654 + ... + 17596.

Almost surely, 2^61609375 is an apocalyptic number.

61609375 is a deficient number, since it is larger than the sum of its proper divisors (15420889).

61609375 is an frugal number, since it uses more digits than its factorization.

61609375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973 (or 3948 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 37.

The square root of 61609375 is about 7849.1639682198. The cubic root of 61609375 is about 394.9561987429.

The spelling of 61609375 in words is "sixty-one million, six hundred nine thousand, three hundred seventy-five".