80661276 has 72 divisors (see below), whose sum is σ = 216381984. Its totient is φ = 25280640.

The previous prime is 80661263. The next prime is 80661293. The reversal of 80661276 is 67216608.

It is a happy number.

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 80661276.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49710 + ... + 51306.

Almost surely, 2^80661276 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 80661276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108190992).

80661276 is an abundant number, since it is smaller than the sum of its proper divisors (135720708).

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

80661276 is a wasteful number, since it uses less digits than its factorization.

80661276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691 (or 1686 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 80661276 is about 8981.1622855842. The cubic root of 80661276 is about 432.0709117133.

The spelling of 80661276 in words is "eighty million, six hundred sixty-one thousand, two hundred seventy-six".