72857929 has 2 divisors, whose sum is σ = 72857930. Its totient is φ = 72857928.

The previous prime is 72857927. The next prime is 72857933. The reversal of 72857929 is 92975827.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54169600 + 18688329 = 7360^2 + 4323^2 .

It is a cyclic number.

It is not a de Polignac number, because 72857929 - 2¹ = 72857927 is a prime.

Together with 72857927, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72857923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36428964 + 36428965.

It is an arithmetic number, because the mean of its divisors is an integer number (36428965).

Almost surely, 2^72857929 is an apocalyptic number.

It is an amenable number.

72857929 is a deficient number, since it is larger than the sum of its proper divisors (1).

72857929 is an equidigital number, since it uses as much as digits as its factorization.

72857929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 49.

The square root of 72857929 is about 8535.6856197965. The cubic root of 72857929 is about 417.6626189507.

The spelling of 72857929 in words is "seventy-two million, eight hundred fifty-seven thousand, nine hundred twenty-nine".