80909680 has 20 divisors (see below), whose sum is σ = 188115192. Its totient is φ = 32363840.

The previous prime is 80909677. The next prime is 80909707. The reversal of 80909680 is 8690908.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 505606 + ... + 505765.

Almost surely, 2^80909680 is an apocalyptic number.

80909680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

80909680 is an abundant number, since it is smaller than the sum of its proper divisors (107205512).

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

80909680 is a wasteful number, since it uses less digits than its factorization.

80909680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011384 (or 1011378 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 80909680 is about 8994.9808226588. The cubic root of 80909680 is about 432.5139915507.

The spelling of 80909680 in words is "eighty million, nine hundred nine thousand, six hundred eighty".