78827730 has 32 divisors (see below), whose sum is σ = 195291648. Its totient is φ = 20342400.

The previous prime is 78827719. The next prime is 78827731. The reversal of 78827730 is 3772887.

It is a super-2 number, since 2×78827730² = 12427622033905800, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78827731) 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, 41451 + ... + 43310.

It is an arithmetic number, because the mean of its divisors is an integer number (6102864).

Almost surely, 2^78827730 is an apocalyptic number.

78827730 is an abundant number, since it is smaller than the sum of its proper divisors (116463918).

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

78827730 is a wasteful number, since it uses less digits than its factorization.

78827730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84802.

The product of its (nonzero) digits is 131712, while the sum is 42.

The square root of 78827730 is about 8878.4981838146. The cubic root of 78827730 is about 428.7719241255.

The spelling of 78827730 in words is "seventy-eight million, eight hundred twenty-seven thousand, seven hundred thirty".