64622381 has 4 divisors (see below), whose sum is σ = 64645152. Its totient is φ = 64599612.

The previous prime is 64622377. The next prime is 64622407. The reversal of 64622381 is 18322646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64622381 - 2² = 64622377 is a prime.

It is a super-2 number, since 2×64622381² = 8352104252218322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64622681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6401 + ... + 13046.

It is an arithmetic number, because the mean of its divisors is an integer number (16161288).

Almost surely, 2^64622381 is an apocalyptic number.

It is an amenable number.

64622381 is a deficient number, since it is larger than the sum of its proper divisors (22771).

64622381 is a wasteful number, since it uses less digits than its factorization.

64622381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22770.

The product of its digits is 13824, while the sum is 32.

The square root of 64622381 is about 8038.8046997051. The cubic root of 64622381 is about 401.2924465404.

The spelling of 64622381 in words is "sixty-four million, six hundred twenty-two thousand, three hundred eighty-one".