71975790 has 80 divisors (see below), whose sum is σ = 204958512. Its totient is φ = 18061056.

The previous prime is 71975789. The next prime is 71975803. The reversal of 71975790 is 9757917.

71975790 is a `hidden beast` number, since 71 + 9 + 7 + 579 + 0 = 666.

It is a super-2 number, since 2×71975790² = 10361028692248200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11157 + ... + 16383.

Almost surely, 2^71975790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71975790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102479256).

71975790 is an abundant number, since it is smaller than the sum of its proper divisors (132982722).

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

71975790 is a wasteful number, since it uses less digits than its factorization.

71975790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5263 (or 5254 counting only the distinct ones).

The product of its (nonzero) digits is 138915, while the sum is 45.

The square root of 71975790 is about 8483.8546663648. The cubic root of 71975790 is about 415.9701308374.

The spelling of 71975790 in words is "seventy-one million, nine hundred seventy-five thousand, seven hundred ninety".