78668031 has 16 divisors (see below), whose sum is σ = 116014304. Its totient is φ = 47101824.

The previous prime is 78667951. The next prime is 78668033. The reversal of 78668031 is 13086687.

It is not a de Polignac number, because 78668031 - 2⁷ = 78667903 is a prime.

It is a super-2 number, since 2×78668031² = 12377318202833922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is the 8870-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78668033) by changing a digit.

It is a nontrivial repunit in base 8869.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25816 + ... + 28701.

It is an arithmetic number, because the mean of its divisors is an integer number (7250894).

Almost surely, 2^78668031 is an apocalyptic number.

78668031 is a deficient number, since it is larger than the sum of its proper divisors (37346273).

78668031 is a wasteful number, since it uses less digits than its factorization.

78668031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54570.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 78668031 is about 8869.5000422797. The cubic root of 78668031 is about 428.4821752390.

The spelling of 78668031 in words is "seventy-eight million, six hundred sixty-eight thousand, thirty-one".