78812749 has 16 divisors (see below), whose sum is σ = 84913920. Its totient is φ = 73003840.

The previous prime is 78812737. The next prime is 78812753. The reversal of 78812749 is 94721887.

It is a cyclic number.

It is not a de Polignac number, because 78812749 - 2⁵ = 78812717 is a prime.

It is a super-2 number, since 2×78812749² = 12422898809874002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78812699 and 78812708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78815749) 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, 71694 + ... + 72784.

It is an arithmetic number, because the mean of its divisors is an integer number (5307120).

Almost surely, 2^78812749 is an apocalyptic number.

It is an amenable number.

78812749 is a deficient number, since it is larger than the sum of its proper divisors (6101171).

78812749 is a wasteful number, since it uses less digits than its factorization.

78812749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220.

The product of its digits is 225792, while the sum is 46.

The square root of 78812749 is about 8877.6544762679. The cubic root of 78812749 is about 428.7447600841.

The spelling of 78812749 in words is "seventy-eight million, eight hundred twelve thousand, seven hundred forty-nine".