81677652 has 24 divisors (see below), whose sum is σ = 217807296. Its totient is φ = 23336448.

The previous prime is 81677647. The next prime is 81677677. The reversal of 81677652 is 25677618.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 486093 + ... + 486260.

It is an arithmetic number, because the mean of its divisors is an integer number (9075304).

Almost surely, 2^81677652 is an apocalyptic number.

It is an amenable number.

81677652 is an abundant number, since it is smaller than the sum of its proper divisors (136129644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81677652 is a wasteful number, since it uses less digits than its factorization.

81677652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972367 (or 972365 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 81677652 is about 9037.5689208990. The cubic root of 81677652 is about 433.8781184928.

The spelling of 81677652 in words is "eighty-one million, six hundred seventy-seven thousand, six hundred fifty-two".