72648749 has 2 divisors, whose sum is σ = 72648750. Its totient is φ = 72648748.

The previous prime is 72648739. The next prime is 72648773. The reversal of 72648749 is 94784627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62694724 + 9954025 = 7918^2 + 3155^2 .

It is a cyclic number.

It is not a de Polignac number, because 72648749 - 2⁴ = 72648733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72648739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36324374 + 36324375.

It is an arithmetic number, because the mean of its divisors is an integer number (36324375).

Almost surely, 2^72648749 is an apocalyptic number.

It is an amenable number.

72648749 is a deficient number, since it is larger than the sum of its proper divisors (1).

72648749 is an equidigital number, since it uses as much as digits as its factorization.

72648749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 47.

The square root of 72648749 is about 8523.4235492553. The cubic root of 72648749 is about 417.2625233432.

The spelling of 72648749 in words is "seventy-two million, six hundred forty-eight thousand, seven hundred forty-nine".