77945442 has 16 divisors (see below), whose sum is σ = 165061152. Its totient is φ = 24453440.

The previous prime is 77945401. The next prime is 77945443. The reversal of 77945442 is 24454977.

It is a junction number, because it is equal to n+sod(n) for n = 77945394 and 77945403.

It is not an unprimeable number, because it can be changed into a prime (77945443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381984 + ... + 382187.

It is an arithmetic number, because the mean of its divisors is an integer number (10316322).

Almost surely, 2^77945442 is an apocalyptic number.

77945442 is an abundant number, since it is smaller than the sum of its proper divisors (87115710).

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

77945442 is a wasteful number, since it uses less digits than its factorization.

77945442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764193.

The product of its digits is 282240, while the sum is 42.

The square root of 77945442 is about 8828.6715875040. The cubic root of 77945442 is about 427.1662262538.

It can be divided in two parts, 77945 and 442, that added together give a palindrome (78387).

The spelling of 77945442 in words is "seventy-seven million, nine hundred forty-five thousand, four hundred forty-two".