61688757 has 16 divisors (see below), whose sum is σ = 88724160. Its totient is φ = 37900032.

The previous prime is 61688747. The next prime is 61688761. The reversal of 61688757 is 75788616.

It is not a de Polignac number, because 61688757 - 2¹⁰ = 61687733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61688717) 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, 37294 + ... + 38912.

It is an arithmetic number, because the mean of its divisors is an integer number (5545260).

Almost surely, 2^61688757 is an apocalyptic number.

It is an amenable number.

61688757 is a deficient number, since it is larger than the sum of its proper divisors (27035403).

61688757 is a wasteful number, since it uses less digits than its factorization.

61688757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612.

The product of its digits is 564480, while the sum is 48.

The square root of 61688757 is about 7854.2190572965. The cubic root of 61688757 is about 395.1257560385.

The spelling of 61688757 in words is "sixty-one million, six hundred eighty-eight thousand, seven hundred fifty-seven".