72351578 has 16 divisors (see below), whose sum is σ = 120907080. Its totient is φ = 32241216.

The previous prime is 72351577. The next prime is 72351589. The reversal of 72351578 is 87515327.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 50794129 + 21557449 = 7127^2 + 4643^2 .

It is not an unprimeable number, because it can be changed into a prime (72351577) 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, 47225 + ... + 48732.

Almost surely, 2^72351578 is an apocalyptic number.

72351578 is a deficient number, since it is larger than the sum of its proper divisors (48555502).

72351578 is a wasteful number, since it uses less digits than its factorization.

72351578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96001.

The product of its digits is 58800, while the sum is 38.

The square root of 72351578 is about 8505.9730777848. The cubic root of 72351578 is about 416.6928058979.

The spelling of 72351578 in words is "seventy-two million, three hundred fifty-one thousand, five hundred seventy-eight".