80449392640 has 416 divisors, whose sum is σ = 216556934400. Its totient is φ = 28547481600.

The previous prime is 80449392577. The next prime is 80449392649. The reversal of 80449392640 is 4629394408.

It is a super-2 number, since 2×80449392640² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80449392649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 796528590 + ... + 796528690.

Almost surely, 2^80449392640 is an apocalyptic number.

80449392640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80449392640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108278467200).

80449392640 is an abundant number, since it is smaller than the sum of its proper divisors (136107541760).

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

80449392640 is a wasteful number, since it uses less digits than its factorization.

80449392640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 261 (or 239 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 49.

The spelling of 80449392640 in words is "eighty billion, four hundred forty-nine million, three hundred ninety-two thousand, six hundred forty".