71999740 has 24 divisors (see below), whose sum is σ = 159158160. Its totient is φ = 27283968.

The previous prime is 71999671. The next prime is 71999771. The reversal of 71999740 is 4799917.

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, 94357 + ... + 95116.

It is an arithmetic number, because the mean of its divisors is an integer number (6631590).

Almost surely, 2^71999740 is an apocalyptic number.

It is an amenable number.

71999740 is an abundant number, since it is smaller than the sum of its proper divisors (87158420).

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

71999740 is a wasteful number, since it uses less digits than its factorization.

71999740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189501 (or 189499 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 71999740 is about 8485.2660535778. The cubic root of 71999740 is about 416.0162638489.

The spelling of 71999740 in words is "seventy-one million, nine hundred ninety-nine thousand, seven hundred forty".