78244989 has 12 divisors (see below), whose sum is σ = 106602624. Its totient is φ = 51049144.

The previous prime is 78244979. The next prime is 78245039. The reversal of 78244989 is 98944287.

It is not a de Polignac number, because 78244989 - 2¹² = 78240893 is a prime.

It is a super-2 number, since 2×78244989² = 12244556607220242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78244909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 724 + ... + 12530.

It is an arithmetic number, because the mean of its divisors is an integer number (8883552).

Almost surely, 2^78244989 is an apocalyptic number.

It is an amenable number.

78244989 is a deficient number, since it is larger than the sum of its proper divisors (28357635).

78244989 is a wasteful number, since it uses less digits than its factorization.

78244989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11904 (or 11857 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The square root of 78244989 is about 8845.6197634762. The cubic root of 78244989 is about 427.7127315777.

The spelling of 78244989 in words is "seventy-eight million, two hundred forty-four thousand, nine hundred eighty-nine".