64407657 has 8 divisors (see below), whose sum is σ = 86404384. Its totient is φ = 42674688.

The previous prime is 64407649. The next prime is 64407661. The reversal of 64407657 is 75670446.

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

It is not a de Polignac number, because 64407657 - 2³ = 64407649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64407647) 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, 65368 + ... + 66345.

It is an arithmetic number, because the mean of its divisors is an integer number (10800548).

Almost surely, 2^64407657 is an apocalyptic number.

It is an amenable number.

64407657 is a deficient number, since it is larger than the sum of its proper divisors (21996727).

64407657 is a wasteful number, since it uses less digits than its factorization.

64407657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131879.

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 64407657 is about 8025.4381188817. The cubic root of 64407657 is about 400.8474885564.

The spelling of 64407657 in words is "sixty-four million, four hundred seven thousand, six hundred fifty-seven".