77889742 has 16 divisors (see below), whose sum is σ = 133747200. Its totient is φ = 33325848.

The previous prime is 77889731. The next prime is 77889743. The reversal of 77889742 is 24798877.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 77889742.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77889743) 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, 4759 + ... + 13357.

It is an arithmetic number, because the mean of its divisors is an integer number (8359200).

Almost surely, 2^77889742 is an apocalyptic number.

77889742 is a deficient number, since it is larger than the sum of its proper divisors (55857458).

77889742 is a wasteful number, since it uses less digits than its factorization.

77889742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9255.

The product of its digits is 1580544, while the sum is 52.

The square root of 77889742 is about 8825.5165287931. The cubic root of 77889742 is about 427.0644506699.

The spelling of 77889742 in words is "seventy-seven million, eight hundred eighty-nine thousand, seven hundred forty-two".