77272393 has 4 divisors (see below), whose sum is σ = 84297168. Its totient is φ = 70247620.

The previous prime is 77272379. The next prime is 77272397. The reversal of 77272393 is 39327277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77272393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77272397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3512371 + ... + 3512392.

It is an arithmetic number, because the mean of its divisors is an integer number (21074292).

Almost surely, 2^77272393 is an apocalyptic number.

It is an amenable number.

77272393 is a deficient number, since it is larger than the sum of its proper divisors (7024775).

77272393 is a wasteful number, since it uses less digits than its factorization.

77272393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7024774.

The product of its digits is 111132, while the sum is 40.

The square root of 77272393 is about 8790.4717165804. The cubic root of 77272393 is about 425.9331615769.

Subtracting from 77272393 its reverse (39327277), we obtain a triangular number (37945116 = T₈₇₁₁).

The spelling of 77272393 in words is "seventy-seven million, two hundred seventy-two thousand, three hundred ninety-three".