77420142 has 48 divisors (see below), whose sum is σ = 179262720. Its totient is φ = 24062976.

The previous prime is 77420137. The next prime is 77420143. The reversal of 77420142 is 24102477.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77420143) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33459 + ... + 35697.

It is an arithmetic number, because the mean of its divisors is an integer number (3734640).

Almost surely, 2^77420142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77420142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89631360).

77420142 is an abundant number, since it is smaller than the sum of its proper divisors (101842578).

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

77420142 is a wasteful number, since it uses less digits than its factorization.

77420142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2377 (or 2374 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 77420142 is about 8798.8716322038. The cubic root of 77420142 is about 426.2044578295.

The spelling of 77420142 in words is "seventy-seven million, four hundred twenty thousand, one hundred forty-two".