72315770 has 16 divisors (see below), whose sum is σ = 131000328. Its totient is φ = 28741440.

The previous prime is 72315721. The next prime is 72315779. The reversal of 72315770 is 7751327.

It can be written as a sum of positive squares in 4 ways, for example, as 32638369 + 39677401 = 5713^2 + 6299^2 .

It is not an unprimeable number, because it can be changed into a prime (72315779) 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, 21461 + ... + 24600.

Almost surely, 2^72315770 is an apocalyptic number.

72315770 is a deficient number, since it is larger than the sum of its proper divisors (58684558).

72315770 is a wasteful number, since it uses less digits than its factorization.

72315770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46225.

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 72315770 is about 8503.8679434714. The cubic root of 72315770 is about 416.6240518195.

The spelling of 72315770 in words is "seventy-two million, three hundred fifteen thousand, seven hundred seventy".