78542628 has 12 divisors (see below), whose sum is σ = 183266160. Its totient is φ = 26180872.

The previous prime is 78542627. The next prime is 78542657. The reversal of 78542628 is 82624587.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 78542628.

It is not an unprimeable number, because it can be changed into a prime (78542627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3272598 + ... + 3272621.

It is an arithmetic number, because the mean of its divisors is an integer number (15272180).

Almost surely, 2^78542628 is an apocalyptic number.

It is an amenable number.

78542628 is an abundant number, since it is smaller than the sum of its proper divisors (104723532).

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

78542628 is a wasteful number, since it uses less digits than its factorization.

78542628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6545226 (or 6545224 counting only the distinct ones).

The product of its digits is 215040, while the sum is 42.

The square root of 78542628 is about 8862.4278840507. The cubic root of 78542628 is about 428.2543761091.

The spelling of 78542628 in words is "seventy-eight million, five hundred forty-two thousand, six hundred twenty-eight".