72577789 has 4 divisors (see below), whose sum is σ = 74919040. Its totient is φ = 70236540.

The previous prime is 72577787. The next prime is 72577793. The reversal of 72577789 is 98777527.

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 not a de Polignac number, because 72577789 - 2¹ = 72577787 is a prime.

It is a super-2 number, since 2×72577789² = 10535070912257042, which contains 22 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 (72577781) 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, 1170579 + ... + 1170640.

It is an arithmetic number, because the mean of its divisors is an integer number (18729760).

Almost surely, 2^72577789 is an apocalyptic number.

It is an amenable number.

72577789 is a deficient number, since it is larger than the sum of its proper divisors (2341251).

72577789 is a wasteful number, since it uses less digits than its factorization.

72577789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341250.

The product of its digits is 1728720, while the sum is 52.

The square root of 72577789 is about 8519.2598856943. The cubic root of 72577789 is about 417.1266247235.

The spelling of 72577789 in words is "seventy-two million, five hundred seventy-seven thousand, seven hundred eighty-nine".