72431390 has 32 divisors (see below), whose sum is σ = 140667840. Its totient is φ = 26750464.

The previous prime is 72431389. The next prime is 72431417. The reversal of 72431390 is 9313427.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4991 + ... + 13029.

It is an arithmetic number, because the mean of its divisors is an integer number (4395870).

Almost surely, 2^72431390 is an apocalyptic number.

72431390 is a deficient number, since it is larger than the sum of its proper divisors (68236450).

72431390 is a wasteful number, since it uses less digits than its factorization.

72431390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8116.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 72431390 is about 8510.6633113994. The cubic root of 72431390 is about 416.8459694080.

The spelling of 72431390 in words is "seventy-two million, four hundred thirty-one thousand, three hundred ninety".