71613620 has 48 divisors (see below), whose sum is σ = 164414208. Its totient is φ = 26040960.

The previous prime is 71613617. The next prime is 71613643. The reversal of 71613620 is 2631617.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 71613620.

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, 15365 + ... + 19475.

It is an arithmetic number, because the mean of its divisors is an integer number (3425296).

Almost surely, 2^71613620 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 71613620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82207104).

71613620 is an abundant number, since it is smaller than the sum of its proper divisors (92800588).

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

71613620 is a wasteful number, since it uses less digits than its factorization.

71613620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4200 (or 4198 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 71613620 is about 8462.4830871323. The cubic root of 71613620 is about 415.2712602126.

The spelling of 71613620 in words is "seventy-one million, six hundred thirteen thousand, six hundred twenty".