72878845 has 16 divisors (see below), whose sum is σ = 94740912. Its totient is φ = 53498880.

The previous prime is 72878833. The next prime is 72878849. The reversal of 72878845 is 54887827.

It can be written as a sum of positive squares in 8 ways, for example, as 4618201 + 68260644 = 2149^2 + 8262^2 .

It is not a de Polignac number, because 72878845 - 2¹⁵ = 72846077 is a prime.

It is a super-2 number, since 2×72878845² = 10622652097068050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72878849) by changing a digit.

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, 8005 + ... + 14485.

It is an arithmetic number, because the mean of its divisors is an integer number (5921307).

Almost surely, 2^72878845 is an apocalyptic number.

It is an amenable number.

72878845 is a deficient number, since it is larger than the sum of its proper divisors (21862067).

72878845 is a wasteful number, since it uses less digits than its factorization.

72878845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6672.

The product of its digits is 1003520, while the sum is 49.

The square root of 72878845 is about 8536.9107410116. The cubic root of 72878845 is about 417.7025825513.

The spelling of 72878845 in words is "seventy-two million, eight hundred seventy-eight thousand, eight hundred forty-five".