83978480 has 40 divisors (see below), whose sum is σ = 205530000. Its totient is φ = 31822848.

The previous prime is 83978471. The next prime is 83978491. The reversal of 83978480 is 8487938.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×83978480² = 14104770206220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26105 + ... + 29144.

It is an arithmetic number, because the mean of its divisors is an integer number (5138250).

Almost surely, 2^83978480 is an apocalyptic number.

83978480 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

83978480 is an abundant number, since it is smaller than the sum of its proper divisors (121551520).

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

83978480 is a wasteful number, since it uses less digits than its factorization.

83978480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55281 (or 55275 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 83978480 is about 9163.9773024599. The cubic root of 83978480 is about 437.9145110914.

The spelling of 83978480 in words is "eighty-three million, nine hundred seventy-eight thousand, four hundred eighty".