78689142 has 24 divisors (see below), whose sum is σ = 194849616. Its totient is φ = 22482576.

The previous prime is 78689131. The next prime is 78689147. The reversal of 78689142 is 24198687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78689147) 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, 312133 + ... + 312384.

It is an arithmetic number, because the mean of its divisors is an integer number (8118734).

Almost surely, 2^78689142 is an apocalyptic number.

78689142 is an abundant number, since it is smaller than the sum of its proper divisors (116160474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78689142 is a wasteful number, since it uses less digits than its factorization.

78689142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624532 (or 624529 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 78689142 is about 8870.6900520760. The cubic root of 78689142 is about 428.5205003293.

The spelling of 78689142 in words is "seventy-eight million, six hundred eighty-nine thousand, one hundred forty-two".