72777729 has 4 divisors (see below), whose sum is σ = 97036976. Its totient is φ = 48518484.

The previous prime is 72777721. The next prime is 72777737. The reversal of 72777729 is 92777727.

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 an interprime number because it is at equal distance from previous prime (72777721) and next prime (72777737).

It is not a de Polignac number, because 72777729 - 2³ = 72777721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72777721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12129619 + ... + 12129624.

It is an arithmetic number, because the mean of its divisors is an integer number (24259244).

It is a Proth number, since it is equal to 2221 ⋅ 2¹⁵ + 1 and 2221 < 2¹⁵.

Almost surely, 2^72777729 is an apocalyptic number.

It is an amenable number.

72777729 is a deficient number, since it is larger than the sum of its proper divisors (24259247).

72777729 is a wasteful number, since it uses less digits than its factorization.

72777729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24259246.

The product of its digits is 605052, while the sum is 48.

The square root of 72777729 is about 8530.9864025211. The cubic root of 72777729 is about 417.5093121855.

The spelling of 72777729 in words is "seventy-two million, seven hundred seventy-seven thousand, seven hundred twenty-nine".