72431368 has 8 divisors (see below), whose sum is σ = 135808830. Its totient is φ = 36215680.

The previous prime is 72431329. The next prime is 72431369. The reversal of 72431368 is 86313427.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 59629284 + 12802084 = 7722^2 + 3578^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (72431369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4526953 + ... + 4526968.

Almost surely, 2^72431368 is an apocalyptic number.

It is an amenable number.

72431368 is a deficient number, since it is larger than the sum of its proper divisors (63377462).

72431368 is a wasteful number, since it uses less digits than its factorization.

72431368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9053927 (or 9053923 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 72431368 is about 8510.6620189031. The cubic root of 72431368 is about 416.8459272043.

The spelling of 72431368 in words is "seventy-two million, four hundred thirty-one thousand, three hundred sixty-eight".