72299388 has 48 divisors (see below), whose sum is σ = 193342464. Its totient is φ = 20598720.

The previous prime is 72299387. The next prime is 72299393. The reversal of 72299388 is 88399227.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72299387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35206 + ... + 37202.

It is an arithmetic number, because the mean of its divisors is an integer number (4027968).

Almost surely, 2^72299388 is an apocalyptic number.

It is an amenable number.

72299388 is an abundant number, since it is smaller than the sum of its proper divisors (121043076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72299388 is a wasteful number, since it uses less digits than its factorization.

72299388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442 (or 2440 counting only the distinct ones).

The product of its digits is 435456, while the sum is 48.

The square root of 72299388 is about 8502.9046801667. The cubic root of 72299388 is about 416.5925895688.

The spelling of 72299388 in words is "seventy-two million, two hundred ninety-nine thousand, three hundred eighty-eight".