78249494 has 16 divisors (see below), whose sum is σ = 118683600. Its totient is φ = 38690784.

The previous prime is 78249481. The next prime is 78249497. The reversal of 78249494 is 49494287.

It is a super-2 number, since 2×78249494² = 12245966622512072, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78249497) 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, 110012 + ... + 110720.

It is an arithmetic number, because the mean of its divisors is an integer number (7417725).

Almost surely, 2^78249494 is an apocalyptic number.

78249494 is a deficient number, since it is larger than the sum of its proper divisors (40434106).

78249494 is a wasteful number, since it uses less digits than its factorization.

78249494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247.

The product of its digits is 580608, while the sum is 47.

The square root of 78249494 is about 8845.8744056198. The cubic root of 78249494 is about 427.7209400219.

The spelling of 78249494 in words is "seventy-eight million, two hundred forty-nine thousand, four hundred ninety-four".