64320402 has 16 divisors (see below), whose sum is σ = 130561632. Its totient is φ = 21120000.

The previous prime is 64320383. The next prime is 64320407. The reversal of 64320402 is 20402346.

It is a super-2 number, since 2×64320402² = 8274228226883208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64320407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79599 + ... + 80402.

It is an arithmetic number, because the mean of its divisors is an integer number (8160102).

Almost surely, 2^64320402 is an apocalyptic number.

64320402 is an abundant number, since it is smaller than the sum of its proper divisors (66241230).

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

64320402 is a wasteful number, since it uses less digits than its factorization.

64320402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160073.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 64320402 is about 8020.0001246883. Note that the first 3 decimals coincide. The cubic root of 64320402 is about 400.6663933499. Note that the first 3 decimals are identical.

Adding to 64320402 its reverse (20402346), we get a palindrome (84722748).

The spelling of 64320402 in words is "sixty-four million, three hundred twenty thousand, four hundred two".