71528040 has 48 divisors (see below), whose sum is σ = 232467300. Its totient is φ = 19074048.

The previous prime is 71528021. The next prime is 71528047. The reversal of 71528040 is 4082517.

It can be written as a sum of positive squares in 2 ways, for example, as 67864644 + 3663396 = 8238^2 + 1914^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71527995 and 71528013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71528047) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98985 + ... + 99704.

Almost surely, 2^71528040 is an apocalyptic number.

It is an amenable number.

71528040 is an abundant number, since it is smaller than the sum of its proper divisors (160939260).

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

71528040 is a wasteful number, since it uses less digits than its factorization.

71528040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198706 (or 198699 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 71528040 is about 8457.4251400766. The cubic root of 71528040 is about 415.1057745574.

The spelling of 71528040 in words is "seventy-one million, five hundred twenty-eight thousand, forty".