71974656 has 216 divisors, whose sum is σ = 234365040. Its totient is φ = 21897216.

The previous prime is 71974633. The next prime is 71974673. The reversal of 71974656 is 65647917.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (216).

It is a super-2 number, since 2×71974656² = 10360702212636672, which contains 22 as substring.

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, 808660 + ... + 808748.

Almost surely, 2^71974656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71974656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117182520).

71974656 is an abundant number, since it is smaller than the sum of its proper divisors (162390384).

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

71974656 is an equidigital number, since it uses as much as digits as its factorization.

71974656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 107 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The square root of 71974656 is about 8483.7878332735. The cubic root of 71974656 is about 415.9679462482.

The spelling of 71974656 in words is "seventy-one million, nine hundred seventy-four thousand, six hundred fifty-six".