80978940 has 240 divisors, whose sum is σ = 299716032. Its totient is φ = 17915904.

The previous prime is 80978927. The next prime is 80978941. The reversal of 80978940 is 4987908.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80978941) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 419484 + ... + 419676.

Almost surely, 2^80978940 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 80978940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149858016).

80978940 is an abundant number, since it is smaller than the sum of its proper divisors (218737092).

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

80978940 is a wasteful number, since it uses less digits than its factorization.

80978940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 80978940 is about 8998.8299239401. The cubic root of 80978940 is about 432.6373693531.

It can be divided in two parts, 80978 and 940, that added together give a palindrome (81918).

The spelling of 80978940 in words is "eighty million, nine hundred seventy-eight thousand, nine hundred forty".