77444140 has 12 divisors (see below), whose sum is σ = 162632736. Its totient is φ = 30977648.

The previous prime is 77444137. The next prime is 77444141. The reversal of 77444140 is 4144477.

It is not an unprimeable number, because it can be changed into a prime (77444141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1936084 + ... + 1936123.

It is an arithmetic number, because the mean of its divisors is an integer number (13552728).

Almost surely, 2^77444140 is an apocalyptic number.

It is an amenable number.

77444140 is an abundant number, since it is smaller than the sum of its proper divisors (85188596).

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

77444140 is a wasteful number, since it uses less digits than its factorization.

77444140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3872216 (or 3872214 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 31.

The square root of 77444140 is about 8800.2352241290. The cubic root of 77444140 is about 426.2484902897.

The spelling of 77444140 in words is "seventy-seven million, four hundred forty-four thousand, one hundred forty".