78305780 has 48 divisors (see below), whose sum is σ = 188455680. Its totient is φ = 26773248.

The previous prime is 78305767. The next prime is 78305809. The reversal of 78305780 is 8750387.

It is a super-2 number, since 2×78305780² = 12263590362816800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79169 + ... + 80151.

It is an arithmetic number, because the mean of its divisors is an integer number (3926160).

Almost surely, 2^78305780 is an apocalyptic number.

78305780 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78305780 is an abundant number, since it is smaller than the sum of its proper divisors (110149900).

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

78305780 is a wasteful number, since it uses less digits than its factorization.

78305780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568 (or 1566 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 78305780 is about 8849.0553168121. The cubic root of 78305780 is about 427.8234707412.

The spelling of 78305780 in words is "seventy-eight million, three hundred five thousand, seven hundred eighty".