77681442 has 16 divisors (see below), whose sum is σ = 162118080. Its totient is φ = 24767952.

The previous prime is 77681437. The next prime is 77681447. The reversal of 77681442 is 24418677.

It is an interprime number because it is at equal distance from previous prime (77681437) and next prime (77681447).

It is a self number, because there is not a number n which added to its sum of digits gives 77681442.

It is not an unprimeable number, because it can be changed into a prime (77681447) 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, 281317 + ... + 281592.

It is an arithmetic number, because the mean of its divisors is an integer number (10132380).

Almost surely, 2^77681442 is an apocalyptic number.

77681442 is an abundant number, since it is smaller than the sum of its proper divisors (84436638).

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

77681442 is a wasteful number, since it uses less digits than its factorization.

77681442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562937.

The product of its digits is 75264, while the sum is 39.

The square root of 77681442 is about 8813.7076193847. The cubic root of 77681442 is about 426.6834122931.

The spelling of 77681442 in words is "seventy-seven million, six hundred eighty-one thousand, four hundred forty-two".