72130402 has 4 divisors (see below), whose sum is σ = 108195606. Its totient is φ = 36065200.

The previous prime is 72130379. The next prime is 72130411. The reversal of 72130402 is 20403127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20403127 = 1487 ⋅13721.

It can be written as a sum of positive squares in only one way, i.e., 53129521 + 19000881 = 7289^2 + 4359^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 72130402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18032599 + ... + 18032602.

Almost surely, 2^72130402 is an apocalyptic number.

72130402 is a deficient number, since it is larger than the sum of its proper divisors (36065204).

72130402 is a wasteful number, since it uses less digits than its factorization.

72130402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36065203.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 72130402 is about 8492.9619097227. The cubic root of 72130402 is about 416.2677678510.

Adding to 72130402 its reverse (20403127), we get a palindrome (92533529).

The spelling of 72130402 in words is "seventy-two million, one hundred thirty thousand, four hundred two".