80691000390 has 768 divisors, whose sum is σ = 298519603200. Its totient is φ = 15454333440.

The previous prime is 80691000347. The next prime is 80691000427. The reversal of 80691000390 is 9300019608.

It is a super-2 number, since 2×80691000390² (a number of 23 digits) 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 383 ways as a sum of consecutive naturals, for example, 119188732 + ... + 119189408.

It is an arithmetic number, because the mean of its divisors is an integer number (388697400).

Almost surely, 2^80691000390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80691000390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149259801600).

80691000390 is an abundant number, since it is smaller than the sum of its proper divisors (217828602810).

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

80691000390 is a wasteful number, since it uses less digits than its factorization.

80691000390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744 (or 718 counting only the distinct ones).

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

Adding to 80691000390 its reverse (9300019608), we get a palindrome (89991019998).

The spelling of 80691000390 in words is "eighty billion, six hundred ninety-one million, three hundred ninety", and thus it is an aban number.