77309142 has 8 divisors (see below), whose sum is σ = 154618296. Its totient is φ = 25769712.

The previous prime is 77309129. The next prime is 77309147. The reversal of 77309142 is 24190377.

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

77309142 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77309147) 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, 6442423 + ... + 6442434.

It is an arithmetic number, because the mean of its divisors is an integer number (19327287).

Almost surely, 2^77309142 is an apocalyptic number.

77309142 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.

77309142 is a wasteful number, since it uses less digits than its factorization.

77309142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12884862.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 77309142 is about 8792.5617427460. The cubic root of 77309142 is about 426.0006722641. Note that the first 3 decimals are identical.

The spelling of 77309142 in words is "seventy-seven million, three hundred nine thousand, one hundred forty-two".