71699640 has 32 divisors (see below), whose sum is σ = 215099280. Its totient is φ = 19119872.

The previous prime is 71699627. The next prime is 71699647. The reversal of 71699640 is 4699617.

It is a super-2 number, since 2×71699640² = 10281676752259200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71699592 and 71699601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71699647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 298629 + ... + 298868.

Almost surely, 2^71699640 is an apocalyptic number.

It is an amenable number.

71699640 is an abundant number, since it is smaller than the sum of its proper divisors (143399640).

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

71699640 is a wasteful number, since it uses less digits than its factorization.

71699640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597511 (or 597507 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 71699640 is about 8467.5639944437. The cubic root of 71699640 is about 415.4374638890.

The spelling of 71699640 in words is "seventy-one million, six hundred ninety-nine thousand, six hundred forty".