64778325 has 12 divisors (see below), whose sum is σ = 107100288. Its totient is φ = 34548400.

The previous prime is 64778317. The next prime is 64778333. The reversal of 64778325 is 52387746.

It is an interprime number because it is at equal distance from previous prime (64778317) and next prime (64778333).

It is not a de Polignac number, because 64778325 - 2³ = 64778317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 431781 + ... + 431930.

It is an arithmetic number, because the mean of its divisors is an integer number (8925024).

Almost surely, 2^64778325 is an apocalyptic number.

It is an amenable number.

64778325 is a deficient number, since it is larger than the sum of its proper divisors (42321963).

64778325 is a wasteful number, since it uses less digits than its factorization.

64778325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863724 (or 863719 counting only the distinct ones).

The product of its digits is 282240, while the sum is 42.

The square root of 64778325 is about 8048.4983071378. The cubic root of 64778325 is about 401.6149812304.

The spelling of 64778325 in words is "sixty-four million, seven hundred seventy-eight thousand, three hundred twenty-five".