64770399 has 12 divisors (see below), whose sum is σ = 95323176. Its totient is φ = 42365232.

The previous prime is 64770379. The next prime is 64770401. The reversal of 64770399 is 99307746.

It is not a de Polignac number, because 64770399 - 2⁵ = 64770367 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64770319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67417 + ... + 68370.

It is an arithmetic number, because the mean of its divisors is an integer number (7943598).

Almost surely, 2^64770399 is an apocalyptic number.

64770399 is a deficient number, since it is larger than the sum of its proper divisors (30552777).

64770399 is a wasteful number, since it uses less digits than its factorization.

64770399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135846 (or 135843 counting only the distinct ones).

The product of its (nonzero) digits is 285768, while the sum is 45.

The square root of 64770399 is about 8048.0059020853. The cubic root of 64770399 is about 401.5986005960.

The spelling of 64770399 in words is "sixty-four million, seven hundred seventy thousand, three hundred ninety-nine".