81876388 has 24 divisors (see below), whose sum is σ = 156671424. Its totient is φ = 37130400.

The previous prime is 81876383. The next prime is 81876391. The reversal of 81876388 is 88367818.

It is not an unprimeable number, because it can be changed into a prime (81876383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19518 + ... + 23338.

It is an arithmetic number, because the mean of its divisors is an integer number (6527976).

Almost surely, 2^81876388 is an apocalyptic number.

It is an amenable number.

81876388 is a deficient number, since it is larger than the sum of its proper divisors (74795036).

81876388 is a wasteful number, since it uses less digits than its factorization.

81876388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4323 (or 4321 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The square root of 81876388 is about 9048.5572330621. The cubic root of 81876388 is about 434.2297338928.

The spelling of 81876388 in words is "eighty-one million, eight hundred seventy-six thousand, three hundred eighty-eight".