81879064 has 32 divisors (see below), whose sum is σ = 161838000. Its totient is φ = 38776192.

The previous prime is 81879047. The next prime is 81879071. The reversal of 81879064 is 46097818.

It is a super-2 number, since 2×81879064² = 13408362243032192, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81879064.

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, 8967 + ... + 15625.

Almost surely, 2^81879064 is an apocalyptic number.

It is an amenable number.

81879064 is a deficient number, since it is larger than the sum of its proper divisors (79958936).

81879064 is a wasteful number, since it uses less digits than its factorization.

81879064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6747 (or 6743 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 81879064 is about 9048.7051007313. The cubic root of 81879064 is about 434.2344645449.

The spelling of 81879064 in words is "eighty-one million, eight hundred seventy-nine thousand, sixty-four".