71974140 has 72 divisors (see below), whose sum is σ = 234439632. Its totient is φ = 16450560.

The previous prime is 71974129. The next prime is 71974181. The reversal of 71974140 is 4147917.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9301 + ... + 15180.

It is an arithmetic number, because the mean of its divisors is an integer number (3256106).

Almost surely, 2^71974140 is an apocalyptic number.

71974140 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71974140 is an abundant number, since it is smaller than the sum of its proper divisors (162465492).

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

71974140 is a wasteful number, since it uses less digits than its factorization.

71974140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24507 (or 24498 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 71974140 is about 8483.7574222746. The cubic root of 71974140 is about 415.9669521947.

The spelling of 71974140 in words is "seventy-one million, nine hundred seventy-four thousand, one hundred forty".