72130440 has 64 divisors (see below), whose sum is σ = 216950400. Its totient is φ = 19185152.

The previous prime is 72130411. The next prime is 72130481. The reversal of 72130440 is 4403127.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88756 + ... + 89564.

It is an arithmetic number, because the mean of its divisors is an integer number (3389850).

Almost surely, 2^72130440 is an apocalyptic number.

It is an amenable number.

72130440 is an abundant number, since it is smaller than the sum of its proper divisors (144819960).

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

72130440 is a wasteful number, since it uses less digits than its factorization.

72130440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1566 (or 1562 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 72130440 is about 8492.9641468689. The cubic root of 72130440 is about 416.2678409509.

Adding to 72130440 its reverse (4403127), we get a palindrome (76533567).

The spelling of 72130440 in words is "seventy-two million, one hundred thirty thousand, four hundred forty".