64390755 has 48 divisors (see below), whose sum is σ = 121998240. Its totient is φ = 28807680.

The previous prime is 64390741. The next prime is 64390763. The reversal of 64390755 is 55709346.

It is not a de Polignac number, because 64390755 - 2¹⁴ = 64374371 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 22231 + ... + 24959.

It is an arithmetic number, because the mean of its divisors is an integer number (2541630).

Almost surely, 2^64390755 is an apocalyptic number.

64390755 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

64390755 is a deficient number, since it is larger than the sum of its proper divisors (57607485).

64390755 is a wasteful number, since it uses less digits than its factorization.

64390755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2772 (or 2761 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 64390755 is about 8024.3850231653. The cubic root of 64390755 is about 400.8124217269.

The spelling of 64390755 in words is "sixty-four million, three hundred ninety thousand, seven hundred fifty-five".