72787261 has 4 divisors (see below), whose sum is σ = 74480032. Its totient is φ = 71094492.

The previous prime is 72787243. The next prime is 72787279. The reversal of 72787261 is 16278727.

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 (72787243) and next prime (72787279).

It is a cyclic number.

It is not a de Polignac number, because 72787261 - 2⁵ = 72787229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72787201) 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, 846321 + ... + 846406.

It is an arithmetic number, because the mean of its divisors is an integer number (18620008).

Almost surely, 2^72787261 is an apocalyptic number.

It is an amenable number.

72787261 is a deficient number, since it is larger than the sum of its proper divisors (1692771).

72787261 is a wasteful number, since it uses less digits than its factorization.

72787261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692770.

The product of its digits is 65856, while the sum is 40.

The square root of 72787261 is about 8531.5450535058. The cubic root of 72787261 is about 417.5275390299.

It can be divided in two parts, 7278726 and 1, that added together give a palindrome (7278727).

The spelling of 72787261 in words is "seventy-two million, seven hundred eighty-seven thousand, two hundred sixty-one".