64742657 has 8 divisors (see below), whose sum is σ = 74160000. Its totient is φ = 55367424.

The previous prime is 64742617. The next prime is 64742659. The reversal of 64742657 is 75624746.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64742657 - 2¹² = 64738561 is a prime.

It is a super-2 number, since 2×64742657² = 8383223270839298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64742659) 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, 7157 + ... + 13442.

It is an arithmetic number, because the mean of its divisors is an integer number (9270000).

Almost surely, 2^64742657 is an apocalyptic number.

It is an amenable number.

64742657 is a deficient number, since it is larger than the sum of its proper divisors (9417343).

64742657 is a wasteful number, since it uses less digits than its factorization.

64742657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21055.

The product of its digits is 282240, while the sum is 41.

The square root of 64742657 is about 8046.2821849597. The cubic root of 64742657 is about 401.5412557824.

The spelling of 64742657 in words is "sixty-four million, seven hundred forty-two thousand, six hundred fifty-seven".