78695840 has 48 divisors (see below), whose sum is σ = 187223400. Its totient is φ = 31257600.

The previous prime is 78695789. The next prime is 78695843. The reversal of 78695840 is 4859687.

It can be written as a sum of positive squares in 4 ways, for example, as 35188624 + 43507216 = 5932^2 + 6596^2 .

It is not an unprimeable number, because it can be changed into a prime (78695843) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 22190 + ... + 25490.

Almost surely, 2^78695840 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 78695840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93611700).

78695840 is an abundant number, since it is smaller than the sum of its proper divisors (108527560).

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

78695840 is a wasteful number, since it uses less digits than its factorization.

78695840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3465 (or 3457 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 47.

The square root of 78695840 is about 8871.0675794968. The cubic root of 78695840 is about 428.5326585034.

The spelling of 78695840 in words is "seventy-eight million, six hundred ninety-five thousand, eight hundred forty".