72287969 has 4 divisors (see below), whose sum is σ = 77848596. Its totient is φ = 66727344.

The previous prime is 72287953. The next prime is 72287977. The reversal of 72287969 is 96978227.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37063744 + 35224225 = 6088^2 + 5935^2 .

It is a cyclic number.

It is not a de Polignac number, because 72287969 - 2⁴ = 72287953 is a prime.

It is a super-2 number, since 2×72287969² = 10451100924289922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72280969) 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, 2780294 + ... + 2780319.

It is an arithmetic number, because the mean of its divisors is an integer number (19462149).

Almost surely, 2^72287969 is an apocalyptic number.

It is an amenable number.

72287969 is a deficient number, since it is larger than the sum of its proper divisors (5560627).

72287969 is a wasteful number, since it uses less digits than its factorization.

72287969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5560626.

The product of its digits is 762048, while the sum is 50.

The square root of 72287969 is about 8502.2331772306. The cubic root of 72287969 is about 416.5706561362.

The spelling of 72287969 in words is "seventy-two million, two hundred eighty-seven thousand, nine hundred sixty-nine".