81876775 has 12 divisors (see below), whose sum is σ = 101759112. Its totient is φ = 65351840.

The previous prime is 81876763. The next prime is 81876787. The reversal of 81876775 is 57767818.

It is an interprime number because it is at equal distance from previous prime (81876763) and next prime (81876787).

It is not a de Polignac number, because 81876775 - 2⁷ = 81876647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8169 + ... + 15181.

It is an arithmetic number, because the mean of its divisors is an integer number (8479926).

Almost surely, 2^81876775 is an apocalyptic number.

81876775 is a deficient number, since it is larger than the sum of its proper divisors (19882337).

81876775 is a wasteful number, since it uses less digits than its factorization.

81876775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7490 (or 7485 counting only the distinct ones).

The product of its digits is 658560, while the sum is 49.

The square root of 81876775 is about 9048.5786176615. The cubic root of 81876775 is about 434.2304180406.

The spelling of 81876775 in words is "eighty-one million, eight hundred seventy-six thousand, seven hundred seventy-five".