787634842 has 4 divisors (see below), whose sum is σ = 1181452266. Its totient is φ = 393817420.

The previous prime is 787634807. The next prime is 787634849. The reversal of 787634842 is 248436787.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248436787 = 59 ⋅4210793.

It can be written as a sum of positive squares in only one way, i.e., 483516121 + 304118721 = 21989^2 + 17439^2 .

It is not an unprimeable number, because it can be changed into a prime (787634849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196908709 + ... + 196908712.

Almost surely, 2^787634842 is an apocalyptic number.

787634842 is a deficient number, since it is larger than the sum of its proper divisors (393817424).

787634842 is a wasteful number, since it uses less digits than its factorization.

787634842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393817423.

The product of its digits is 1806336, while the sum is 49.

The square root of 787634842 is about 28064.8328339935. The cubic root of 787634842 is about 923.5100794495.

The spelling of 787634842 in words is "seven hundred eighty-seven million, six hundred thirty-four thousand, eight hundred forty-two".