72320390 has 16 divisors (see below), whose sum is σ = 131746608. Its totient is φ = 28579296.

The previous prime is 72320383. The next prime is 72320399. The reversal of 72320390 is 9302327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72320399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42737 + ... + 44396.

It is an arithmetic number, because the mean of its divisors is an integer number (8234163).

Almost surely, 2^72320390 is an apocalyptic number.

72320390 is a deficient number, since it is larger than the sum of its proper divisors (59426218).

72320390 is a wasteful number, since it uses less digits than its factorization.

72320390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87223.

The product of its (nonzero) digits is 2268, while the sum is 26.

The square root of 72320390 is about 8504.1395802280. The cubic root of 72320390 is about 416.6329238453.

The spelling of 72320390 in words is "seventy-two million, three hundred twenty thousand, three hundred ninety".