78919620 has 144 divisors (see below), whose sum is σ = 246197952. Its totient is φ = 18869760.

The previous prime is 78919591. The next prime is 78919649. The reversal of 78919620 is 2691987.

It is an interprime number because it is at equal distance from previous prime (78919591) and next prime (78919649).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 435930 + ... + 436110.

It is an arithmetic number, because the mean of its divisors is an integer number (1709708).

Almost surely, 2^78919620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78919620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123098976).

78919620 is an abundant number, since it is smaller than the sum of its proper divisors (167278332).

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

78919620 is a wasteful number, since it uses less digits than its factorization.

78919620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 78919620 is about 8883.6715382774. The cubic root of 78919620 is about 428.9384668402.

The spelling of 78919620 in words is "seventy-eight million, nine hundred nineteen thousand, six hundred twenty".