64616481 has 16 divisors (see below), whose sum is σ = 95886720. Its totient is φ = 43006320.

The previous prime is 64616479. The next prime is 64616501. The reversal of 64616481 is 18461646.

64616481 is a `hidden beast` number, since 6 + 4 + 6 + 1 + 648 + 1 = 666.

It is not a de Polignac number, because 64616481 - 2¹ = 64616479 is a prime.

It is a super-2 number, since 2×64616481² = 8350579233646722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64616411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18451 + ... + 21671.

It is an arithmetic number, because the mean of its divisors is an integer number (5992920).

Almost surely, 2^64616481 is an apocalyptic number.

It is an amenable number.

64616481 is a deficient number, since it is larger than the sum of its proper divisors (31270239).

64616481 is a wasteful number, since it uses less digits than its factorization.

64616481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973 (or 3967 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 64616481 is about 8038.4377213486. The cubic root of 64616481 is about 401.2802335503.

The spelling of 64616481 in words is "sixty-four million, six hundred sixteen thousand, four hundred eighty-one".