72128753 has 2 divisors, whose sum is σ = 72128754. Its totient is φ = 72128752.

The previous prime is 72128711. The next prime is 72128801. The reversal of 72128753 is 35782127.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63170704 + 8958049 = 7948^2 + 2993^2 .

It is a cyclic number.

It is not a de Polignac number, because 72128753 - 2²⁴ = 55351537 is a prime.

It is not a weakly prime, because it can be changed into another prime (72158753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36064376 + 36064377.

It is an arithmetic number, because the mean of its divisors is an integer number (36064377).

Almost surely, 2^72128753 is an apocalyptic number.

It is an amenable number.

72128753 is a deficient number, since it is larger than the sum of its proper divisors (1).

72128753 is an equidigital number, since it uses as much as digits as its factorization.

72128753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 35.

The square root of 72128753 is about 8492.8648287842. The cubic root of 72128753 is about 416.2645956760.

The spelling of 72128753 in words is "seventy-two million, one hundred twenty-eight thousand, seven hundred fifty-three".