77555442 has 8 divisors (see below), whose sum is σ = 155110896. Its totient is φ = 25851812.

The previous prime is 77555399. The next prime is 77555447. The reversal of 77555442 is 24455577.

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

77555442 is an admirable number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 77555442.

It is not an unprimeable number, because it can be changed into a prime (77555447) 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, 6462948 + ... + 6462959.

It is an arithmetic number, because the mean of its divisors is an integer number (19388862).

Almost surely, 2^77555442 is an apocalyptic number.

77555442 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.

77555442 is a wasteful number, since it uses less digits than its factorization.

77555442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12925912.

The product of its digits is 196000, while the sum is 39.

The square root of 77555442 is about 8806.5567618678. The cubic root of 77555442 is about 426.4525926690.

The spelling of 77555442 in words is "seventy-seven million, five hundred fifty-five thousand, four hundred forty-two".