80129940 has 96 divisors (see below), whose sum is σ = 246564864. Its totient is φ = 19282560.

The previous prime is 80129939. The next prime is 80129977. The reversal of 80129940 is 4992108.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 109857 + ... + 110583.

It is an arithmetic number, because the mean of its divisors is an integer number (2568384).

Almost surely, 2^80129940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80129940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123282432).

80129940 is an abundant number, since it is smaller than the sum of its proper divisors (166434924).

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

80129940 is a wasteful number, since it uses less digits than its factorization.

80129940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 80129940 is about 8951.5328296331. The cubic root of 80129940 is about 431.1201011832.

The spelling of 80129940 in words is "eighty million, one hundred twenty-nine thousand, nine hundred forty".