775342638 has 32 divisors (see below), whose sum is σ = 1969125120. Its totient is φ = 221526360.

The previous prime is 775342621. The next prime is 775342721. The reversal of 775342638 is 836243577.

775342638 is a `hidden beast` number, since 7 + 7 + 5 + 3 + 4 + 2 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 775342593 and 775342602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1025208 + ... + 1025963.

It is an arithmetic number, because the mean of its divisors is an integer number (61535160).

Almost surely, 2^775342638 is an apocalyptic number.

775342638 is an abundant number, since it is smaller than the sum of its proper divisors (1193782482).

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

775342638 is a wasteful number, since it uses less digits than its factorization.

775342638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2051189 (or 2051183 counting only the distinct ones).

The product of its digits is 846720, while the sum is 45.

The square root of 775342638 is about 27844.9750942607. The cubic root of 775342638 is about 918.6806221664.

The spelling of 775342638 in words is "seven hundred seventy-five million, three hundred forty-two thousand, six hundred thirty-eight".