72777623 has 4 divisors (see below), whose sum is σ = 73054608. Its totient is φ = 72500640.

The previous prime is 72777613. The next prime is 72777659. The reversal of 72777623 is 32677727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32677727 = 283 ⋅115469.

It is a cyclic number.

It is not a de Polignac number, because 72777623 - 2²⁴ = 56000407 is a prime.

It is a super-3 number, since 3×72777623³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72777613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138098 + ... + 138623.

It is an arithmetic number, because the mean of its divisors is an integer number (18263652).

Almost surely, 2^72777623 is an apocalyptic number.

72777623 is a deficient number, since it is larger than the sum of its proper divisors (276985).

72777623 is a wasteful number, since it uses less digits than its factorization.

72777623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276984.

The product of its digits is 172872, while the sum is 41.

The square root of 72777623 is about 8530.9801898727. The cubic root of 72777623 is about 417.5091094861.

The spelling of 72777623 in words is "seventy-two million, seven hundred seventy-seven thousand, six hundred twenty-three".