71499840 has 112 divisors (see below), whose sum is σ = 230428800. Its totient is φ = 18780160.

The previous prime is 71499839. The next prime is 71499863. The reversal of 71499840 is 4899417.

It is a super-2 number, since 2×71499840² = 10224454240051200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 71499792 and 71499801.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67636 + ... + 68684.

It is an arithmetic number, because the mean of its divisors is an integer number (2057400).

Almost surely, 2^71499840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71499840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115214400).

71499840 is an abundant number, since it is smaller than the sum of its proper divisors (158928960).

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

71499840 is a wasteful number, since it uses less digits than its factorization.

71499840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1140 (or 1130 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 71499840 is about 8455.7578016403. The cubic root of 71499840 is about 415.0512154337.

The spelling of 71499840 in words is "seventy-one million, four hundred ninety-nine thousand, eight hundred forty".