81376810 has 16 divisors (see below), whose sum is σ = 154188000. Its totient is φ = 30837456.

The previous prime is 81376741. The next prime is 81376819. The reversal of 81376810 is 1867318.

It is a super-2 number, since 2×81376810² = 13244370411552200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81376819) 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, 213960 + ... + 214339.

It is an arithmetic number, because the mean of its divisors is an integer number (9636750).

Almost surely, 2^81376810 is an apocalyptic number.

81376810 is a deficient number, since it is larger than the sum of its proper divisors (72811190).

81376810 is a wasteful number, since it uses less digits than its factorization.

81376810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428325.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 81376810 is about 9020.9095993697. The cubic root of 81376810 is about 433.3447643270.

The spelling of 81376810 in words is "eighty-one million, three hundred seventy-six thousand, eight hundred ten".