64404375 has 60 divisors (see below), whose sum is σ = 125003736. Its totient is φ = 29400000.

The previous prime is 64404371. The next prime is 64404413. The reversal of 64404375 is 57340446.

It is a happy number.

It is not a de Polignac number, because 64404375 - 2² = 64404371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64404371) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 91525 + ... + 92225.

Almost surely, 2^64404375 is an apocalyptic number.

64404375 is a deficient number, since it is larger than the sum of its proper divisors (60599361).

64404375 is an equidigital number, since it uses as much as digits as its factorization.

64404375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738 (or 716 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 33.

The square root of 64404375 is about 8025.2336414587. The cubic root of 64404375 is about 400.8406798225.

The spelling of 64404375 in words is "sixty-four million, four hundred four thousand, three hundred seventy-five".