77440068 has 36 divisors (see below), whose sum is σ = 197078700. Its totient is φ = 25638336.

The previous prime is 77440061. The next prime is 77440123. The reversal of 77440068 is 86004477.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 22353984 + 55086084 = 4728^2 + 7422^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (77440061) 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 11 ways as a sum of consecutive naturals, for example, 1855 + ... + 12582.

Almost surely, 2^77440068 is an apocalyptic number.

It is an amenable number.

77440068 is an abundant number, since it is smaller than the sum of its proper divisors (119638632).

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

77440068 is a wasteful number, since it uses less digits than its factorization.

77440068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14596 (or 14591 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 36.

The square root of 77440068 is about 8800.0038636355. The cubic root of 77440068 is about 426.2410194672.

The spelling of 77440068 in words is "seventy-seven million, four hundred forty thousand, sixty-eight".