81577630 has 16 divisors (see below), whose sum is σ = 147963024. Its totient is φ = 32381440.

The previous prime is 81577607. The next prime is 81577669. The reversal of 81577630 is 3677518.

It is a self number, because there is not a number n which added to its sum of digits gives 81577630.

It is a congruent number.

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, 29827 + ... + 32446.

It is an arithmetic number, because the mean of its divisors is an integer number (9247689).

Almost surely, 2^81577630 is an apocalyptic number.

81577630 is a deficient number, since it is larger than the sum of its proper divisors (66385394).

81577630 is a wasteful number, since it uses less digits than its factorization.

81577630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62411.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 81577630 is about 9032.0335473248. The cubic root of 81577630 is about 433.7009379018.

The spelling of 81577630 in words is "eighty-one million, five hundred seventy-seven thousand, six hundred thirty".