72029557 has 2 divisors, whose sum is σ = 72029558. Its totient is φ = 72029556.

The previous prime is 72029549. The next prime is 72029599. The reversal of 72029557 is 75592027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56340036 + 15689521 = 7506^2 + 3961^2 .

It is a cyclic number.

It is not a de Polignac number, because 72029557 - 2³ = 72029549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72021557) by changing a digit.

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, 36014778 + 36014779.

It is an arithmetic number, because the mean of its divisors is an integer number (36014779).

Almost surely, 2^72029557 is an apocalyptic number.

It is an amenable number.

72029557 is a deficient number, since it is larger than the sum of its proper divisors (1).

72029557 is an equidigital number, since it uses as much as digits as its factorization.

72029557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 44100, while the sum is 37.

The square root of 72029557 is about 8487.0228584587. The cubic root of 72029557 is about 416.0736837090.

The spelling of 72029557 in words is "seventy-two million, twenty-nine thousand, five hundred fifty-seven".