72878175 has 18 divisors (see below), whose sum is σ = 130533312. Its totient is φ = 38868240.

The previous prime is 72878173. The next prime is 72878177. The reversal of 72878175 is 57187827.

It is an interprime number because it is at equal distance from previous prime (72878173) and next prime (72878177).

It is not a de Polignac number, because 72878175 - 2¹ = 72878173 is a prime.

It is a super-2 number, since 2×72878175² = 10622456782661250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 72878175.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72878171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 161727 + ... + 162176.

Almost surely, 2^72878175 is an apocalyptic number.

72878175 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

72878175 is a deficient number, since it is larger than the sum of its proper divisors (57655137).

72878175 is a wasteful number, since it uses less digits than its factorization.

72878175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323919 (or 323911 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 72878175 is about 8536.8714995600. The cubic root of 72878175 is about 417.7013025200.

The spelling of 72878175 in words is "seventy-two million, eight hundred seventy-eight thousand, one hundred seventy-five".