78678270 has 128 divisors (see below), whose sum is σ = 233280000. Its totient is φ = 18708480.

The previous prime is 78678253. The next prime is 78678283. The reversal of 78678270 is 7287687.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 175006 + ... + 175454.

It is an arithmetic number, because the mean of its divisors is an integer number (1822500).

Almost surely, 2^78678270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78678270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116640000).

78678270 is an abundant number, since it is smaller than the sum of its proper divisors (154601730).

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

78678270 is a wasteful number, since it uses less digits than its factorization.

78678270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 78678270 is about 8870.0772262704. The cubic root of 78678270 is about 428.5007640635.

The spelling of 78678270 in words is "seventy-eight million, six hundred seventy-eight thousand, two hundred seventy".