72393551 has 2 divisors, whose sum is σ = 72393552. Its totient is φ = 72393550.

The previous prime is 72393547. The next prime is 72393611. The reversal of 72393551 is 15539327.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72393551 - 2² = 72393547 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72393751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36196775 + 36196776.

It is an arithmetic number, because the mean of its divisors is an integer number (36196776).

Almost surely, 2^72393551 is an apocalyptic number.

72393551 is a deficient number, since it is larger than the sum of its proper divisors (1).

72393551 is an equidigital number, since it uses as much as digits as its factorization.

72393551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28350, while the sum is 35.

The square root of 72393551 is about 8508.4399862725. The cubic root of 72393551 is about 416.7733683708.

The spelling of 72393551 in words is "seventy-two million, three hundred ninety-three thousand, five hundred fifty-one".