71398656 has 216 divisors, whose sum is σ = 248713920. Its totient is φ = 19243008.

The previous prime is 71398651. The next prime is 71398681. The reversal of 71398656 is 65689317.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71398651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 306316 + ... + 306548.

Almost surely, 2^71398656 is an apocalyptic number.

71398656 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71398656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124356960).

71398656 is an abundant number, since it is smaller than the sum of its proper divisors (177315264).

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

71398656 is a wasteful number, since it uses less digits than its factorization.

71398656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 264 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 71398656 is about 8449.7725413173. The cubic root of 71398656 is about 414.8553344898.

The spelling of 71398656 in words is "seventy-one million, three hundred ninety-eight thousand, six hundred fifty-six".