81876530 has 16 divisors (see below), whose sum is σ = 148284864. Its totient is φ = 32549040.

The previous prime is 81876499. The next prime is 81876551. The reversal of 81876530 is 3567818.

It is a super-3 number, since 3×81876530³ (a number of 25 digits) contains 333 as substring.

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, 23486 + ... + 26745.

It is an arithmetic number, because the mean of its divisors is an integer number (9267804).

Almost surely, 2^81876530 is an apocalyptic number.

81876530 is a deficient number, since it is larger than the sum of its proper divisors (66408334).

81876530 is a wasteful number, since it uses less digits than its factorization.

81876530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50401.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 81876530 is about 9048.5650796135. The cubic root of 81876530 is about 434.2299849241.

The spelling of 81876530 in words is "eighty-one million, eight hundred seventy-six thousand, five hundred thirty".