72915289 has 2 divisors, whose sum is σ = 72915290. Its totient is φ = 72915288.

The previous prime is 72915277. The next prime is 72915299. The reversal of 72915289 is 98251927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39275289 + 33640000 = 6267^2 + 5800^2 .

It is a cyclic number.

It is not a de Polignac number, because 72915289 - 2¹³ = 72907097 is a prime.

It is not a weakly prime, because it can be changed into another prime (72915239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36457644 + 36457645.

It is an arithmetic number, because the mean of its divisors is an integer number (36457645).

Almost surely, 2^72915289 is an apocalyptic number.

It is an amenable number.

72915289 is a deficient number, since it is larger than the sum of its proper divisors (1).

72915289 is an equidigital number, since it uses as much as digits as its factorization.

72915289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 72915289 is about 8539.0449700186. The cubic root of 72915289 is about 417.7721967911.

It can be divided in two parts, 729152 and 89, that multiplied together give a triangular number (64894528 = T₁₁₃₉₂).

The spelling of 72915289 in words is "seventy-two million, nine hundred fifteen thousand, two hundred eighty-nine".