71452640 has 96 divisors (see below), whose sum is σ = 194793984. Its totient is φ = 24261120.

The previous prime is 71452637. The next prime is 71452657. The reversal of 71452640 is 4625417.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146477 + ... + 146963.

It is an arithmetic number, because the mean of its divisors is an integer number (2029104).

Almost surely, 2^71452640 is an apocalyptic number.

71452640 is a gapful number since it is divisible by the number (70) 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 71452640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97396992).

71452640 is an abundant number, since it is smaller than the sum of its proper divisors (123341344).

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

71452640 is a wasteful number, since it uses less digits than its factorization.

71452640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 71452640 is about 8452.9663432431. The cubic root of 71452640 is about 414.9598645078.

The spelling of 71452640 in words is "seventy-one million, four hundred fifty-two thousand, six hundred forty".