78626969 has 4 divisors (see below), whose sum is σ = 78682320. Its totient is φ = 78571620.

The previous prime is 78626957. The next prime is 78627049. The reversal of 78626969 is 96962687.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78626969 is a prime.

It is a super-2 number, since 2×78626969² = 12364400508253922, 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 78626969.

It is not an unprimeable number, because it can be changed into a prime (78626269) 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 3 ways as a sum of consecutive naturals, for example, 25487 + ... + 28404.

It is an arithmetic number, because the mean of its divisors is an integer number (19670580).

Almost surely, 2^78626969 is an apocalyptic number.

It is an amenable number.

78626969 is a deficient number, since it is larger than the sum of its proper divisors (55351).

78626969 is a wasteful number, since it uses less digits than its factorization.

78626969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55350.

The product of its digits is 1959552, while the sum is 53.

The square root of 78626969 is about 8867.1849535239. The cubic root of 78626969 is about 428.4076112899.

The spelling of 78626969 in words is "seventy-eight million, six hundred twenty-six thousand, nine hundred sixty-nine".