71501640 has 64 divisors (see below), whose sum is σ = 245151360. Its totient is φ = 16343040.

The previous prime is 71501623. The next prime is 71501653. The reversal of 71501640 is 4610517.

It is a super-2 number, since 2×71501640² = 10224969045379200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 71501640.

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, 41721 + ... + 43400.

It is an arithmetic number, because the mean of its divisors is an integer number (3830490).

Almost surely, 2^71501640 is an apocalyptic number.

71501640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

71501640 is an abundant number, since it is smaller than the sum of its proper divisors (173649720).

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

71501640 is a wasteful number, since it uses less digits than its factorization.

71501640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85142 (or 85138 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 71501640 is about 8455.8642373207. The cubic root of 71501640 is about 415.0546983595.

The spelling of 71501640 in words is "seventy-one million, five hundred one thousand, six hundred forty".