78305380 has 48 divisors (see below), whose sum is σ = 173021184. Its totient is φ = 29727360.

The previous prime is 78305371. The next prime is 78305387. The reversal of 78305380 is 8350387.

It is a super-2 number, since 2×78305380² = 12263465073888800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78305387) 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, 31669 + ... + 34051.

It is an arithmetic number, because the mean of its divisors is an integer number (3604608).

Almost surely, 2^78305380 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 78305380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86510592).

78305380 is an abundant number, since it is smaller than the sum of its proper divisors (94715804).

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

78305380 is a wasteful number, since it uses less digits than its factorization.

78305380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2476 (or 2474 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 78305380 is about 8849.0327155006. The cubic root of 78305380 is about 427.8227422735.

The spelling of 78305380 in words is "seventy-eight million, three hundred five thousand, three hundred eighty".