72193669 has 4 divisors (see below), whose sum is σ = 72222444. Its totient is φ = 72164896.

The previous prime is 72193651. The next prime is 72193687. The reversal of 72193669 is 96639127.

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

It is an interprime number because it is at equal distance from previous prime (72193651) and next prime (72193687).

It can be written as a sum of positive squares in 2 ways, for example, as 9229444 + 62964225 = 3038^2 + 7935^2 .

It is a cyclic number.

It is not a de Polignac number, because 72193669 - 2⁹ = 72193157 is a prime.

It is a super-2 number, since 2×72193669² = 10423851687363122, 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 (72193609) 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, 10222 + ... + 15775.

It is an arithmetic number, because the mean of its divisors is an integer number (18055611).

Almost surely, 2^72193669 is an apocalyptic number.

It is an amenable number.

72193669 is a deficient number, since it is larger than the sum of its proper divisors (28775).

72193669 is a wasteful number, since it uses less digits than its factorization.

72193669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28774.

The product of its digits is 122472, while the sum is 43.

The square root of 72193669 is about 8496.6857656383. The cubic root of 72193669 is about 416.3894378447.

The spelling of 72193669 in words is "seventy-two million, one hundred ninety-three thousand, six hundred sixty-nine".