81876739 has 4 divisors (see below), whose sum is σ = 93573424. Its totient is φ = 70180056.

The previous prime is 81876737. The next prime is 81876763. The reversal of 81876739 is 93767818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81876739 - 2¹ = 81876737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81876692 and 81876701.

It is not an unprimeable number, because it can be changed into a prime (81876733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5848332 + ... + 5848345.

It is an arithmetic number, because the mean of its divisors is an integer number (23393356).

Almost surely, 2^81876739 is an apocalyptic number.

81876739 is a deficient number, since it is larger than the sum of its proper divisors (11696685).

81876739 is a wasteful number, since it uses less digits than its factorization.

81876739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11696684.

The product of its digits is 508032, while the sum is 49.

The square root of 81876739 is about 9048.5766283985. The cubic root of 81876739 is about 434.2303543990.

The spelling of 81876739 in words is "eighty-one million, eight hundred seventy-six thousand, seven hundred thirty-nine".