72042500 has 30 divisors (see below), whose sum is σ = 157548006. Its totient is φ = 28816000.

The previous prime is 72042491. The next prime is 72042511. The reversal of 72042500 is 524027.

It can be written as a sum of positive squares in 5 ways, for example, as 9821956 + 62220544 = 3134^2 + 7888^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 11909 + ... + 16908.

Almost surely, 2^72042500 is an apocalyptic number.

It is an amenable number.

72042500 is an abundant number, since it is smaller than the sum of its proper divisors (85505506).

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

72042500 is a wasteful number, since it uses less digits than its factorization.

72042500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28841 (or 28824 counting only the distinct ones).

The product of its (nonzero) digits is 560, while the sum is 20.

The square root of 72042500 is about 8487.7853413008. The cubic root of 72042500 is about 416.0986036603.

Adding to 72042500 its reverse (524027), we get a palindrome (72566527).

The spelling of 72042500 in words is "seventy-two million, forty-two thousand, five hundred".