80644690 has 24 divisors (see below), whose sum is σ = 168861132. Its totient is φ = 27649440.

The previous prime is 80644673. The next prime is 80644699. The reversal of 80644690 is 9644608.

It can be written as a sum of positive squares in 2 ways, for example, as 79405921 + 1238769 = 8911^2 + 1113^2 .

It is a super-2 number, since 2×80644690² = 13007132050392200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (80644699) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81801 + ... + 82780.

Almost surely, 2^80644690 is an apocalyptic number.

80644690 is an abundant number, since it is smaller than the sum of its proper divisors (88216442).

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

80644690 is a wasteful number, since it uses less digits than its factorization.

80644690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164602 (or 164595 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 80644690 is about 8980.2388609658. The cubic root of 80644690 is about 432.0412947779.

The spelling of 80644690 in words is "eighty million, six hundred forty-four thousand, six hundred ninety".