78123494 has 12 divisors (see below), whose sum is σ = 119738364. Its totient is φ = 38228484.

The previous prime is 78123481. The next prime is 78123523. The reversal of 78123494 is 49432187.

It is a super-2 number, since 2×78123494² = 12206560629536072, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4424 + ... + 13259.

It is an arithmetic number, because the mean of its divisors is an integer number (9978197).

Almost surely, 2^78123494 is an apocalyptic number.

78123494 is a deficient number, since it is larger than the sum of its proper divisors (41614870).

78123494 is a wasteful number, since it uses less digits than its factorization.

78123494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17779 (or 17732 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 78123494 is about 8838.7495721963. The cubic root of 78123494 is about 427.4912397462.

The spelling of 78123494 in words is "seventy-eight million, one hundred twenty-three thousand, four hundred ninety-four".