71515140 has 48 divisors (see below), whose sum is σ = 206707200. Its totient is φ = 18455040.

The previous prime is 71515099. The next prime is 71515151. The reversal of 71515140 is 4151517.

It is a super-2 number, since 2×71515140² = 10228830498439200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 71515140.

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, 17365 + ... + 21084.

It is an arithmetic number, because the mean of its divisors is an integer number (4306400).

Almost surely, 2^71515140 is an apocalyptic number.

It is an amenable number.

71515140 is an abundant number, since it is smaller than the sum of its proper divisors (135192060).

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

71515140 is a wasteful number, since it uses less digits than its factorization.

71515140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38492 (or 38490 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 24.

The square root of 71515140 is about 8456.6624622247. The cubic root of 71515140 is about 415.0808184402.

Adding to 71515140 its reverse (4151517), we get a palindrome (75666657).

The spelling of 71515140 in words is "seventy-one million, five hundred fifteen thousand, one hundred forty".