64481557 has 16 divisors (see below), whose sum is σ = 75146112. Its totient is φ = 54190080.

The previous prime is 64481507. The next prime is 64481563. The reversal of 64481557 is 75518446.

It is a de Polignac number, because none of the positive numbers 2^k-64481557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64481507) 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, 131082 + ... + 131572.

It is an arithmetic number, because the mean of its divisors is an integer number (4696632).

Almost surely, 2^64481557 is an apocalyptic number.

It is an amenable number.

64481557 is a deficient number, since it is larger than the sum of its proper divisors (10664555).

64481557 is a wasteful number, since it uses less digits than its factorization.

64481557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828.

The product of its digits is 134400, while the sum is 40.

The square root of 64481557 is about 8030.0409089867. The cubic root of 64481557 is about 401.0007379708. Note that the first 3 decimals are identical.

The spelling of 64481557 in words is "sixty-four million, four hundred eighty-one thousand, five hundred fifty-seven".