71423720 has 16 divisors (see below), whose sum is σ = 160703460. Its totient is φ = 28569472.

The previous prime is 71423713. The next prime is 71423743. The reversal of 71423720 is 2732417.

It can be written as a sum of positive squares in 2 ways, for example, as 71334916 + 88804 = 8446^2 + 298^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 71423720.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892757 + ... + 892836.

Almost surely, 2^71423720 is an apocalyptic number.

It is an amenable number.

71423720 is an abundant number, since it is smaller than the sum of its proper divisors (89279740).

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

71423720 is a wasteful number, since it uses less digits than its factorization.

71423720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785604 (or 1785600 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 71423720 is about 8451.2555280266. The cubic root of 71423720 is about 414.9038728341.

The spelling of 71423720 in words is "seventy-one million, four hundred twenty-three thousand, seven hundred twenty".