72434057 has 2 divisors, whose sum is σ = 72434058. Its totient is φ = 72434056.

The previous prime is 72434053. The next prime is 72434081. The reversal of 72434057 is 75043427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72403081 + 30976 = 8509^2 + 176^2 .

It is an emirp because it is prime and its reverse (75043427) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72434057 - 2² = 72434053 is a prime.

It is a super-2 number, since 2×72434057² = 10493385226958498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72434051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36217028 + 36217029.

It is an arithmetic number, because the mean of its divisors is an integer number (36217029).

Almost surely, 2^72434057 is an apocalyptic number.

It is an amenable number.

72434057 is a deficient number, since it is larger than the sum of its proper divisors (1).

72434057 is an equidigital number, since it uses as much as digits as its factorization.

72434057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23520, while the sum is 32.

The square root of 72434057 is about 8510.8199957466. The cubic root of 72434057 is about 416.8510855809.

The spelling of 72434057 in words is "seventy-two million, four hundred thirty-four thousand, fifty-seven".