72764389 has 4 divisors (see below), whose sum is σ = 74137356. Its totient is φ = 71391424.

The previous prime is 72764327. The next prime is 72764401. The reversal of 72764389 is 98346727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98346727 = 929 ⋅105863.

It can be written as a sum of positive squares in 2 ways, for example, as 43007364 + 29757025 = 6558^2 + 5455^2 .

It is not a de Polignac number, because 72764389 - 2⁷ = 72764261 is a prime.

It is a super-3 number, since 3×72764389³ (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 (72764189) 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, 686404 + ... + 686509.

It is an arithmetic number, because the mean of its divisors is an integer number (18534339).

Almost surely, 2^72764389 is an apocalyptic number.

It is an amenable number.

72764389 is a deficient number, since it is larger than the sum of its proper divisors (1372967).

72764389 is a wasteful number, since it uses less digits than its factorization.

72764389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372966.

The product of its digits is 508032, while the sum is 46.

The square root of 72764389 is about 8530.2045110302. The cubic root of 72764389 is about 417.4838011093.

It can be divided in two parts, 72764 and 389, that added together give a triangular number (73153 = T₃₈₂).

The spelling of 72764389 in words is "seventy-two million, seven hundred sixty-four thousand, three hundred eighty-nine".