72797749 has 2 divisors, whose sum is σ = 72797750. Its totient is φ = 72797748.

The previous prime is 72797741. The next prime is 72797761. The reversal of 72797749 is 94779727.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71520849 + 1276900 = 8457^2 + 1130^2 .

It is a cyclic number.

It is not a de Polignac number, because 72797749 - 2³ = 72797741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 72797696 and 72797705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72797741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36398874 + 36398875.

It is an arithmetic number, because the mean of its divisors is an integer number (36398875).

Almost surely, 2^72797749 is an apocalyptic number.

It is an amenable number.

72797749 is a deficient number, since it is larger than the sum of its proper divisors (1).

72797749 is an equidigital number, since it uses as much as digits as its factorization.

72797749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555848, while the sum is 52.

The square root of 72797749 is about 8532.1596914263. The cubic root of 72797749 is about 417.5475920742.

The spelling of 72797749 in words is "seventy-two million, seven hundred ninety-seven thousand, seven hundred forty-nine".