80661256 has 64 divisors (see below), whose sum is σ = 170311680. Its totient is φ = 35562240.

The previous prime is 80661247. The next prime is 80661263. The reversal of 80661256 is 65216608.

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, 409350 + ... + 409546.

It is an arithmetic number, because the mean of its divisors is an integer number (2661120).

Almost surely, 2^80661256 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 80661256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85155840).

80661256 is an abundant number, since it is smaller than the sum of its proper divisors (89650424).

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

80661256 is a wasteful number, since it uses less digits than its factorization.

80661256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 80661256 is about 8981.1611721425. The cubic root of 80661256 is about 432.0708760026.

The spelling of 80661256 in words is "eighty million, six hundred sixty-one thousand, two hundred fifty-six".