64403957 has 8 divisors (see below), whose sum is σ = 67737600. Its totient is φ = 61148880.

The previous prime is 64403947. The next prime is 64404061. The reversal of 64403957 is 75930446.

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

It is a cyclic number.

It is not a de Polignac number, because 64403957 - 2⁶ = 64403893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64403957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64403917) 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, 17957 + ... + 21242.

It is an arithmetic number, because the mean of its divisors is an integer number (8467200).

Almost surely, 2^64403957 is an apocalyptic number.

It is an amenable number.

64403957 is a deficient number, since it is larger than the sum of its proper divisors (3333643).

64403957 is a wasteful number, since it uses less digits than its factorization.

64403957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39283.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 64403957 is about 8025.2075985609. The cubic root of 64403957 is about 400.8398126362.

The spelling of 64403957 in words is "sixty-four million, four hundred three thousand, nine hundred fifty-seven".