72323149 has 4 divisors (see below), whose sum is σ = 72783964. Its totient is φ = 71862336.

The previous prime is 72323143. The next prime is 72323161. The reversal of 72323149 is 94132327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94132327 = 19 ⋅4954333.

It can be written as a sum of positive squares in 2 ways, for example, as 17489124 + 54834025 = 4182^2 + 7405^2 .

It is a cyclic number.

It is not a de Polignac number, because 72323149 - 2⁷ = 72323021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72323149.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72323143) 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, 230172 + ... + 230485.

It is an arithmetic number, because the mean of its divisors is an integer number (18195991).

Almost surely, 2^72323149 is an apocalyptic number.

It is an amenable number.

72323149 is a deficient number, since it is larger than the sum of its proper divisors (460815).

72323149 is a wasteful number, since it uses less digits than its factorization.

72323149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460814.

The product of its digits is 9072, while the sum is 31.

The square root of 72323149 is about 8504.3017937982. The cubic root of 72323149 is about 416.6382219160.

The spelling of 72323149 in words is "seventy-two million, three hundred twenty-three thousand, one hundred forty-nine".