72049457 has 2 divisors, whose sum is σ = 72049458. Its totient is φ = 72049456.

The previous prime is 72049447. The next prime is 72049489. The reversal of 72049457 is 75494027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68574961 + 3474496 = 8281^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 72049457 - 2⁴ = 72049441 is a prime.

It is a super-2 number, since 2×72049457² = 10382248507989698, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72049457.

It is not a weakly prime, because it can be changed into another prime (72049447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36024728 + 36024729.

It is an arithmetic number, because the mean of its divisors is an integer number (36024729).

Almost surely, 2^72049457 is an apocalyptic number.

It is an amenable number.

72049457 is a deficient number, since it is larger than the sum of its proper divisors (1).

72049457 is an equidigital number, since it uses as much as digits as its factorization.

72049457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 72049457 is about 8488.1951556264. The cubic root of 72049457 is about 416.1119971656. Note that the first 3 decimals are identical.

It can be divided in two parts, 7204 and 9457, that added together give a palindrome (16661).

The spelling of 72049457 in words is "seventy-two million, forty-nine thousand, four hundred fifty-seven".