77639742 has 16 divisors (see below), whose sum is σ = 172532880. Its totient is φ = 25879896.

The previous prime is 77639729. The next prime is 77639761. The reversal of 77639742 is 24793677.

It is a happy number.

77639742 is a `hidden beast` number, since 7 + 7 + 639 + 7 + 4 + 2 = 666.

It is a super-3 number, since 3×77639742³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 718833 + ... + 718940.

It is an arithmetic number, because the mean of its divisors is an integer number (10783305).

Almost surely, 2^77639742 is an apocalyptic number.

77639742 is an abundant number, since it is smaller than the sum of its proper divisors (94893138).

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

77639742 is a wasteful number, since it uses less digits than its factorization.

77639742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1437784 (or 1437778 counting only the distinct ones).

The product of its digits is 444528, while the sum is 45.

The square root of 77639742 is about 8811.3416685542. The cubic root of 77639742 is about 426.6070496401.

The spelling of 77639742 in words is "seventy-seven million, six hundred thirty-nine thousand, seven hundred forty-two".