77144442 has 8 divisors (see below), whose sum is σ = 154288896. Its totient is φ = 25714812.

The previous prime is 77144401. The next prime is 77144449. The reversal of 77144442 is 24444177.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

77144442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (77144449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6428698 + ... + 6428709.

It is an arithmetic number, because the mean of its divisors is an integer number (19286112).

Almost surely, 2^77144442 is an apocalyptic number.

77144442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

77144442 is a wasteful number, since it uses less digits than its factorization.

77144442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12857412.

The product of its digits is 25088, while the sum is 33.

The square root of 77144442 is about 8783.1908780352. The cubic root of 77144442 is about 425.6979387937.

The spelling of 77144442 in words is "seventy-seven million, one hundred forty-four thousand, four hundred forty-two".