72657407 has 2 divisors, whose sum is σ = 72657408. Its totient is φ = 72657406.

The previous prime is 72657373. The next prime is 72657419. The reversal of 72657407 is 70475627.

It is a strong prime.

It is an emirp because it is prime and its reverse (70475627) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72657407 - 2²² = 68463103 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72657467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36328703 + 36328704.

It is an arithmetic number, because the mean of its divisors is an integer number (36328704).

Almost surely, 2^72657407 is an apocalyptic number.

72657407 is a deficient number, since it is larger than the sum of its proper divisors (1).

72657407 is an equidigital number, since it uses as much as digits as its factorization.

72657407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82320, while the sum is 38.

The square root of 72657407 is about 8523.9314286308. The cubic root of 72657407 is about 417.2790986018.

The spelling of 72657407 in words is "seventy-two million, six hundred fifty-seven thousand, four hundred seven".