71919690 has 64 divisors (see below), whose sum is σ = 188697600. Its totient is φ = 17464320.

The previous prime is 71919667. The next prime is 71919691. The reversal of 71919690 is 9691917.

It is a super-2 number, since 2×71919690² = 10344883619392200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71919691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13536 + ... + 18084.

It is an arithmetic number, because the mean of its divisors is an integer number (2948400).

Almost surely, 2^71919690 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71919690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

71919690 is an abundant number, since it is smaller than the sum of its proper divisors (116777910).

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

71919690 is a wasteful number, since it uses less digits than its factorization.

71919690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4607.

The product of its (nonzero) digits is 30618, while the sum is 42.

The square root of 71919690 is about 8480.5477417440. The cubic root of 71919690 is about 415.8620297205.

The spelling of 71919690 in words is "seventy-one million, nine hundred nineteen thousand, six hundred ninety".