72797551 has 2 divisors, whose sum is σ = 72797552. Its totient is φ = 72797550.

The previous prime is 72797533. The next prime is 72797573. The reversal of 72797551 is 15579727.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72797551 - 2⁷ = 72797423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72797498 and 72797507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72797521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36398775 + 36398776.

It is an arithmetic number, because the mean of its divisors is an integer number (36398776).

Almost surely, 2^72797551 is an apocalyptic number.

72797551 is a deficient number, since it is larger than the sum of its proper divisors (1).

72797551 is an equidigital number, since it uses as much as digits as its factorization.

72797551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 154350, while the sum is 43.

The square root of 72797551 is about 8532.1480882601. The cubic root of 72797551 is about 417.5472135163.

The spelling of 72797551 in words is "seventy-two million, seven hundred ninety-seven thousand, five hundred fifty-one".