78228570 has 64 divisors (see below), whose sum is σ = 216078336. Its totient is φ = 17755200.

The previous prime is 78228569. The next prime is 78228599. The reversal of 78228570 is 7582287.

It is a super-2 number, since 2×78228570² = 12239418328489800, which contains 22 as substring.

It is a Curzon 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 31 ways as a sum of consecutive naturals, for example, 30477 + ... + 32943.

It is an arithmetic number, because the mean of its divisors is an integer number (3376224).

Almost surely, 2^78228570 is an apocalyptic number.

78228570 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78228570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108039168).

78228570 is an abundant number, since it is smaller than the sum of its proper divisors (137849766).

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

78228570 is a wasteful number, since it uses less digits than its factorization.

78228570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2635.

The product of its (nonzero) digits is 62720, while the sum is 39.

The square root of 78228570 is about 8844.6916283158. The cubic root of 78228570 is about 427.6828122747.

The spelling of 78228570 in words is "seventy-eight million, two hundred twenty-eight thousand, five hundred seventy".