71077920 has 48 divisors (see below), whose sum is σ = 223896960. Its totient is φ = 18953984.

The previous prime is 71077873. The next prime is 71077933. The reversal of 71077920 is 2977017.

It is a tau number, because it is divible by the number of its divisors (48).

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, 73560 + ... + 74519.

It is an arithmetic number, because the mean of its divisors is an integer number (4664520).

Almost surely, 2^71077920 is an apocalyptic number.

It is an amenable number.

71077920 is an abundant number, since it is smaller than the sum of its proper divisors (152819040).

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

71077920 is a wasteful number, since it uses less digits than its factorization.

71077920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148097 (or 148089 counting only the distinct ones).

The product of its (nonzero) digits is 6174, while the sum is 33.

The square root of 71077920 is about 8430.7722066250. The cubic root of 71077920 is about 414.2331996173.

The spelling of 71077920 in words is "seventy-one million, seventy-seven thousand, nine hundred twenty".