77070842 has 4 divisors (see below), whose sum is σ = 115606266. Its totient is φ = 38535420.

The previous prime is 77070827. The next prime is 77070863. The reversal of 77070842 is 24807077.

It is a Cunningham number, because it is equal to 8779²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 77070841 + 1 = 8779^2 + 1^2 .

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 as a sum of consecutive naturals, namely, 19267709 + ... + 19267712.

Almost surely, 2^77070842 is an apocalyptic number.

77070842 is a deficient number, since it is larger than the sum of its proper divisors (38535424).

77070842 is a wasteful number, since it uses less digits than its factorization.

77070842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38535423.

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 77070842 is about 8779.0000569541. Note that the first 4 decimals coincide. The cubic root of 77070842 is about 425.5625160434.

The spelling of 77070842 in words is "seventy-seven million, seventy thousand, eight hundred forty-two".