61713657 has 10 divisors (see below), whose sum is σ = 92189658. Its totient is φ = 41142384.

The previous prime is 61713649. The next prime is 61713671. The reversal of 61713657 is 75631716.

61713657 is a `hidden beast` number, since 617 + 1 + 36 + 5 + 7 = 666.

It can be written as a sum of positive squares in only one way, i.e., 56610576 + 5103081 = 7524^2 + 2259^2 .

It is not a de Polignac number, because 61713657 - 2³ = 61713649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61713257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 380868 + ... + 381029.

Almost surely, 2^61713657 is an apocalyptic number.

It is an amenable number.

61713657 is a deficient number, since it is larger than the sum of its proper divisors (30476001).

61713657 is an equidigital number, since it uses as much as digits as its factorization.

61713657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761909 (or 761900 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 61713657 is about 7855.8040326882. The cubic root of 61713657 is about 395.1789116342.

The spelling of 61713657 in words is "sixty-one million, seven hundred thirteen thousand, six hundred fifty-seven".