80642820 has 48 divisors (see below), whose sum is σ = 228009600. Its totient is φ = 21294336.

The previous prime is 80642813. The next prime is 80642857. The reversal of 80642820 is 2824608.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 345 + ... + 12704.

It is an arithmetic number, because the mean of its divisors is an integer number (4750200).

Almost surely, 2^80642820 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 80642820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114004800).

80642820 is an abundant number, since it is smaller than the sum of its proper divisors (147366780).

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

80642820 is a wasteful number, since it uses less digits than its factorization.

80642820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13164 (or 13162 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 80642820 is about 8980.1347428644. The cubic root of 80642820 is about 432.0379553414.

The spelling of 80642820 in words is "eighty million, six hundred forty-two thousand, eight hundred twenty".