72878317 has 4 divisors (see below), whose sum is σ = 72930816. Its totient is φ = 72825820.

The previous prime is 72878293. The next prime is 72878327. The reversal of 72878317 is 71387827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71387827 = 7 ⋅10198261.

It is a cyclic number.

It is not a de Polignac number, because 72878317 - 2²³ = 64489709 is a prime.

It is a super-2 number, since 2×72878317² = 10622498177504978, 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 (72878327) 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 3 ways as a sum of consecutive naturals, for example, 24109 + ... + 26962.

It is an arithmetic number, because the mean of its divisors is an integer number (18232704).

Almost surely, 2^72878317 is an apocalyptic number.

It is an amenable number.

72878317 is a deficient number, since it is larger than the sum of its proper divisors (52499).

72878317 is a wasteful number, since it uses less digits than its factorization.

72878317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52498.

The product of its digits is 131712, while the sum is 43.

The square root of 72878317 is about 8536.8798164200. The cubic root of 72878317 is about 417.7015738109.

The spelling of 72878317 in words is "seventy-two million, eight hundred seventy-eight thousand, three hundred seventeen".