80279640 has 384 divisors, whose sum is σ = 327499200. Its totient is φ = 17418240.

The previous prime is 80279623. The next prime is 80279659. The reversal of 80279640 is 4697208.

80279640 is a `hidden beast` number, since 8 + 0 + 2 + 7 + 9 + 640 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 80279595 and 80279604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1958020 + ... + 1958060.

Almost surely, 2^80279640 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 80279640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163749600).

80279640 is an abundant number, since it is smaller than the sum of its proper divisors (247219560).

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

80279640 is a wasteful number, since it uses less digits than its factorization.

80279640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 95 counting only the distinct ones).

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

The square root of 80279640 is about 8959.8906243324. The cubic root of 80279640 is about 431.3884092591.

The spelling of 80279640 in words is "eighty million, two hundred seventy-nine thousand, six hundred forty".