80691390 has 160 divisors (see below), whose sum is σ = 239057280. Its totient is φ = 19408896.

The previous prime is 80691371. The next prime is 80691421. The reversal of 80691390 is 9319608.

It is a super-2 number, since 2×80691390² = 13022200840264200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 831822 + ... + 831918.

It is an arithmetic number, because the mean of its divisors is an integer number (1494108).

Almost surely, 2^80691390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80691390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119528640).

80691390 is an abundant number, since it is smaller than the sum of its proper divisors (158365890).

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

80691390 is a wasteful number, since it uses less digits than its factorization.

80691390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 80691390 is about 8982.8386382034. The cubic root of 80691390 is about 432.1246746637.

The spelling of 80691390 in words is "eighty million, six hundred ninety-one thousand, three hundred ninety".