72878781 has 8 divisors (see below), whose sum is σ = 98622304. Its totient is φ = 47860560.

The previous prime is 72878759. The next prime is 72878797. The reversal of 72878781 is 18787827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72878781 - 2⁵ = 72878749 is a prime.

It is a super-2 number, since 2×72878781² = 10622633440091922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72878781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72878681) 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, 181090 + ... + 181491.

It is an arithmetic number, because the mean of its divisors is an integer number (12327788).

Almost surely, 2^72878781 is an apocalyptic number.

It is an amenable number.

72878781 is a deficient number, since it is larger than the sum of its proper divisors (25743523).

72878781 is a wasteful number, since it uses less digits than its factorization.

72878781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362651.

The product of its digits is 351232, while the sum is 48.

The square root of 72878781 is about 8536.9069925823. The cubic root of 72878781 is about 417.7024602800.

The spelling of 72878781 in words is "seventy-two million, eight hundred seventy-eight thousand, seven hundred eighty-one".