78920380 has 72 divisors (see below), whose sum is σ = 210346416. Its totient is φ = 24595200.

The previous prime is 78920323. The next prime is 78920381. The reversal of 78920380 is 8302987.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78920381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7120 + ... + 14440.

It is an arithmetic number, because the mean of its divisors is an integer number (2921478).

Almost surely, 2^78920380 is an apocalyptic number.

78920380 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78920380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105173208).

78920380 is an abundant number, since it is smaller than the sum of its proper divisors (131426036).

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

78920380 is a wasteful number, since it uses less digits than its factorization.

78920380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7355 (or 7346 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 78920380 is about 8883.7143132814. The cubic root of 78920380 is about 428.9398437356.

The spelling of 78920380 in words is "seventy-eight million, nine hundred twenty thousand, three hundred eighty".