80863640 has 128 divisors (see below), whose sum is σ = 217969920. Its totient is φ = 26611200.

The previous prime is 80863621. The next prime is 80863661. The reversal of 80863640 is 4636808.

It is a self number, because there is not a number n which added to its sum of digits gives 80863640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 383135 + ... + 383345.

It is an arithmetic number, because the mean of its divisors is an integer number (1702890).

Almost surely, 2^80863640 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 80863640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108984960).

80863640 is an abundant number, since it is smaller than the sum of its proper divisors (137106280).

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

80863640 is a wasteful number, since it uses less digits than its factorization.

80863640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 80863640 is about 8992.4212534778. The cubic root of 80863640 is about 432.4319382356.

The spelling of 80863640 in words is "eighty million, eight hundred sixty-three thousand, six hundred forty".