72070657 has 2 divisors, whose sum is σ = 72070658. Its totient is φ = 72070656.

The previous prime is 72070601. The next prime is 72070699. The reversal of 72070657 is 75607027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65674816 + 6395841 = 8104^2 + 2529^2 .

It is an emirp because it is prime and its reverse (75607027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72070657 - 2⁷ = 72070529 is a prime.

It is not a weakly prime, because it can be changed into another prime (72070057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36035328 + 36035329.

It is an arithmetic number, because the mean of its divisors is an integer number (36035329).

Almost surely, 2^72070657 is an apocalyptic number.

It is an amenable number.

72070657 is a deficient number, since it is larger than the sum of its proper divisors (1).

72070657 is an equidigital number, since it uses as much as digits as its factorization.

72070657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20580, while the sum is 34.

The square root of 72070657 is about 8489.4438569320. The cubic root of 72070657 is about 416.1528057510.

It can be divided in two parts, 72070 and 657, that added together give a palindrome (72727).

The spelling of 72070657 in words is "seventy-two million, seventy thousand, six hundred fifty-seven".