64356381 has 12 divisors (see below), whose sum is σ = 94347552. Its totient is φ = 42263496.

The previous prime is 64356377. The next prime is 64356449. The reversal of 64356381 is 18365346.

64356381 is a `hidden beast` number, since 643 + 5 + 6 + 3 + 8 + 1 = 666.

It is not a de Polignac number, because 64356381 - 2² = 64356377 is a prime.

It is a super-2 number, since 2×64356381² = 8283487550834322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64356311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52761 + ... + 53966.

It is an arithmetic number, because the mean of its divisors is an integer number (7862296).

Almost surely, 2^64356381 is an apocalyptic number.

It is an amenable number.

64356381 is a deficient number, since it is larger than the sum of its proper divisors (29991171).

64356381 is a wasteful number, since it uses less digits than its factorization.

64356381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106800 (or 106797 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 64356381 is about 8022.2428908629. The cubic root of 64356381 is about 400.7410865456.

The spelling of 64356381 in words is "sixty-four million, three hundred fifty-six thousand, three hundred eighty-one".