78529860 has 72 divisors (see below), whose sum is σ = 239180760. Its totient is φ = 20855808.

The previous prime is 78529859. The next prime is 78529879. The reversal of 78529860 is 6892587.

It can be written as a sum of positive squares in 4 ways, for example, as 14561856 + 63968004 = 3816^2 + 7998^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51996 + ... + 53484.

It is an arithmetic number, because the mean of its divisors is an integer number (3321955).

Almost surely, 2^78529860 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 78529860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119590380).

78529860 is an abundant number, since it is smaller than the sum of its proper divisors (160650900).

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

78529860 is a wasteful number, since it uses less digits than its factorization.

78529860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1797 (or 1792 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 78529860 is about 8861.7075104068. The cubic root of 78529860 is about 428.2311689737.

The spelling of 78529860 in words is "seventy-eight million, five hundred twenty-nine thousand, eight hundred sixty".