71613980 has 24 divisors (see below), whose sum is σ = 151353888. Its totient is φ = 28461888.

The previous prime is 71613959. The next prime is 71613989. The reversal of 71613980 is 8931617.

It is a self number, because there is not a number n which added to its sum of digits gives 71613980.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71613989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8264 + ... + 14543.

It is an arithmetic number, because the mean of its divisors is an integer number (6306412).

Almost surely, 2^71613980 is an apocalyptic number.

It is an amenable number.

71613980 is an abundant number, since it is smaller than the sum of its proper divisors (79739908).

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

71613980 is a wasteful number, since it uses less digits than its factorization.

71613980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22973 (or 22971 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 71613980 is about 8462.5043574583. The cubic root of 71613980 is about 415.2719560644.

The spelling of 71613980 in words is "seventy-one million, six hundred thirteen thousand, nine hundred eighty".