78520827 has 32 divisors (see below), whose sum is σ = 136212480. Its totient is φ = 39013920.

The previous prime is 78520811. The next prime is 78520829. The reversal of 78520827 is 72802587.

It is not a de Polignac number, because 78520827 - 2⁴ = 78520811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78520829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2077 + ... + 12702.

It is an arithmetic number, because the mean of its divisors is an integer number (4256640).

Almost surely, 2^78520827 is an apocalyptic number.

78520827 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

78520827 is a deficient number, since it is larger than the sum of its proper divisors (57691653).

78520827 is a wasteful number, since it uses less digits than its factorization.

78520827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14823.

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

The square root of 78520827 is about 8861.1978309933. The cubic root of 78520827 is about 428.2147490604.

It can be divided in two parts, 785 and 20827, that added together give a palindrome (21612).

The spelling of 78520827 in words is "seventy-eight million, five hundred twenty thousand, eight hundred twenty-seven".