80621856 has 216 divisors, whose sum is σ = 277297020. Its totient is φ = 22127616.

The previous prime is 80621843. The next prime is 80621869. The reversal of 80621856 is 65812608.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (80621843) and next prime (80621869).

It can be written as a sum of positive squares in 2 ways, for example, as 71978256 + 8643600 = 8484^2 + 2940^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 80621856.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 409150 + ... + 409346.

Almost surely, 2^80621856 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 80621856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138648510).

80621856 is an abundant number, since it is smaller than the sum of its proper divisors (196675164).

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

80621856 is a wasteful number, since it uses less digits than its factorization.

80621856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 238 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 80621856 is about 8978.9674239302. The cubic root of 80621856 is about 432.0005144027. Note that the first 3 decimals are identical.

The spelling of 80621856 in words is "eighty million, six hundred twenty-one thousand, eight hundred fifty-six".