61739657 has 8 divisors (see below), whose sum is σ = 72000000. Its totient is φ = 52919412.

The previous prime is 61739617. The next prime is 61739663. The reversal of 61739657 is 75693716.

It is not a de Polignac number, because 61739657 - 2⁶ = 61739593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61739617) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89657 + ... + 90342.

It is an arithmetic number, because the mean of its divisors is an integer number (9000000).

Almost surely, 2^61739657 is an apocalyptic number.

It is an amenable number.

61739657 is a deficient number, since it is larger than the sum of its proper divisors (10260343).

61739657 is an equidigital number, since it uses as much as digits as its factorization.

61739657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180020 (or 180006 counting only the distinct ones).

The product of its digits is 238140, while the sum is 44.

The square root of 61739657 is about 7857.4586858602. The cubic root of 61739657 is about 395.2344002118.

The spelling of 61739657 in words is "sixty-one million, seven hundred thirty-nine thousand, six hundred fifty-seven".