71955440 has 40 divisors (see below), whose sum is σ = 167788368. Its totient is φ = 28697600.

The previous prime is 71955427. The next prime is 71955479. The reversal of 71955440 is 4455917.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 71955440.

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, 30959 + ... + 33201.

Almost surely, 2^71955440 is an apocalyptic number.

It is an amenable number.

71955440 is an abundant number, since it is smaller than the sum of its proper divisors (95832928).

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

71955440 is a wasteful number, since it uses less digits than its factorization.

71955440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2657 (or 2651 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 71955440 is about 8482.6552446743. The cubic root of 71955440 is about 415.9309241816.

The spelling of 71955440 in words is "seventy-one million, nine hundred fifty-five thousand, four hundred forty".