72742451 has 2 divisors, whose sum is σ = 72742452. Its totient is φ = 72742450.

The previous prime is 72742441. The next prime is 72742463. The reversal of 72742451 is 15424727.

It is a weak prime.

It is an emirp because it is prime and its reverse (15424727) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72742451 - 2⁶ = 72742387 is a prime.

It is equal to p_4269812 and since 72742451 and 4269812 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (72742441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36371225 + 36371226.

It is an arithmetic number, because the mean of its divisors is an integer number (36371226).

Almost surely, 2^72742451 is an apocalyptic number.

72742451 is a deficient number, since it is larger than the sum of its proper divisors (1).

72742451 is an equidigital number, since it uses as much as digits as its factorization.

72742451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 32.

The square root of 72742451 is about 8528.9185129183. The cubic root of 72742451 is about 417.4418406561.

The spelling of 72742451 in words is "seventy-two million, seven hundred forty-two thousand, four hundred fifty-one".