71978160 has 40 divisors (see below), whose sum is σ = 223133040. Its totient is φ = 19194112.

The previous prime is 71978143. The next prime is 71978177. The reversal of 71978160 is 6187917.

It is an interprime number because it is at equal distance from previous prime (71978143) and next prime (71978177).

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

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, 149715 + ... + 150194.

It is an arithmetic number, because the mean of its divisors is an integer number (5578326).

Almost surely, 2^71978160 is an apocalyptic number.

It is an amenable number.

71978160 is an abundant number, since it is smaller than the sum of its proper divisors (151154880).

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

71978160 is a wasteful number, since it uses less digits than its factorization.

71978160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299925 (or 299919 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 39.

The square root of 71978160 is about 8483.9943422895. The cubic root of 71978160 is about 415.9746964392.

The spelling of 71978160 in words is "seventy-one million, nine hundred seventy-eight thousand, one hundred sixty".