78265680 has 80 divisors (see below), whose sum is σ = 245609280. Its totient is φ = 20614144.

The previous prime is 78265673. The next prime is 78265699. The reversal of 78265680 is 8656287.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×78265680² = 12251033331724800, 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, 17956 + ... + 21884.

It is an arithmetic number, because the mean of its divisors is an integer number (3070116).

Almost surely, 2^78265680 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 78265680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122804640).

78265680 is an abundant number, since it is smaller than the sum of its proper divisors (167343600).

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

78265680 is a wasteful number, since it uses less digits than its factorization.

78265680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028 (or 4022 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 78265680 is about 8846.7892480832. The cubic root of 78265680 is about 427.7504295154.

The spelling of 78265680 in words is "seventy-eight million, two hundred sixty-five thousand, six hundred eighty".