71951540 has 24 divisors (see below), whose sum is σ = 151683840. Its totient is φ = 28669088.

The previous prime is 71951489. The next prime is 71951563. The reversal of 71951540 is 4515917.

It is a junction number, because it is equal to n+sod(n) for n = 71951497 and 71951506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1580 + ... + 12099.

It is an arithmetic number, because the mean of its divisors is an integer number (6320160).

Almost surely, 2^71951540 is an apocalyptic number.

It is an amenable number.

71951540 is an abundant number, since it is smaller than the sum of its proper divisors (79732300).

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

71951540 is a wasteful number, since it uses less digits than its factorization.

71951540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13951 (or 13949 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 32.

The square root of 71951540 is about 8482.4253607090. The cubic root of 71951540 is about 415.9234095313.

The spelling of 71951540 in words is "seventy-one million, nine hundred fifty-one thousand, five hundred forty".