64081556 has 24 divisors (see below), whose sum is σ = 139814976. Its totient is φ = 24966720.

The previous prime is 64081541. The next prime is 64081579. The reversal of 64081556 is 65518046.

It is a happy number.

It is a super-2 number, since 2×64081556² = 8212891638762272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103721 + ... + 104336.

It is an arithmetic number, because the mean of its divisors is an integer number (5825624).

Almost surely, 2^64081556 is an apocalyptic number.

It is an amenable number.

64081556 is an abundant number, since it is smaller than the sum of its proper divisors (75733420).

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

64081556 is a wasteful number, since it uses less digits than its factorization.

64081556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208079 (or 208077 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 64081556 is about 8005.0956271615. The cubic root of 64081556 is about 400.1698362123.

The spelling of 64081556 in words is "sixty-four million, eighty-one thousand, five hundred fifty-six".