78874820 has 24 divisors (see below), whose sum is σ = 172839744. Its totient is φ = 30178016.

The previous prime is 78874811. The next prime is 78874841. The reversal of 78874820 is 2847887.

It is a happy 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 7 ways as a sum of consecutive naturals, for example, 85274 + ... + 86193.

It is an arithmetic number, because the mean of its divisors is an integer number (7201656).

Almost surely, 2^78874820 is an apocalyptic number.

It is an amenable number.

78874820 is an abundant number, since it is smaller than the sum of its proper divisors (93964924).

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

78874820 is a wasteful number, since it uses less digits than its factorization.

78874820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171499 (or 171497 counting only the distinct ones).

The product of its (nonzero) digits is 200704, while the sum is 44.

The square root of 78874820 is about 8881.1497003485. The cubic root of 78874820 is about 428.8572868555.

The spelling of 78874820 in words is "seventy-eight million, eight hundred seventy-four thousand, eight hundred twenty".