64644330 has 16 divisors (see below), whose sum is σ = 155146464. Its totient is φ = 17238480.

The previous prime is 64644311. The next prime is 64644373. The reversal of 64644330 is 3344646.

It is a super-2 number, since 2×64644330² = 8357778802297800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2154811 = 64644330 / (6 + 4 + 6 + 4 + 4 + 3 + 3 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1077376 + ... + 1077435.

It is an arithmetic number, because the mean of its divisors is an integer number (9696654).

Almost surely, 2^64644330 is an apocalyptic number.

64644330 is an abundant number, since it is smaller than the sum of its proper divisors (90502134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64644330 is a wasteful number, since it uses less digits than its factorization.

64644330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2154821.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 64644330 is about 8040.1697743269. The cubic root of 64644330 is about 401.3378744079.

Adding to 64644330 its reverse (3344646), we get a palindrome (67988976).

The spelling of 64644330 in words is "sixty-four million, six hundred forty-four thousand, three hundred thirty".