78268380 has 48 divisors (see below), whose sum is σ = 221628960. Its totient is φ = 20635648.

The previous prime is 78268373. The next prime is 78268387. The reversal of 78268380 is 8386287.

It is an interprime number because it is at equal distance from previous prime (78268373) and next prime (78268387).

It is a super-2 number, since 2×78268380² = 12251878615648800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78268387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1989 + ... + 12668.

It is an arithmetic number, because the mean of its divisors is an integer number (4617270).

Almost surely, 2^78268380 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 78268380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110814480).

78268380 is an abundant number, since it is smaller than the sum of its proper divisors (143360580).

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

78268380 is a wasteful number, since it uses less digits than its factorization.

78268380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14758 (or 14756 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 78268380 is about 8846.9418445020. The cubic root of 78268380 is about 427.7553482865.

The spelling of 78268380 in words is "seventy-eight million, two hundred sixty-eight thousand, three hundred eighty".