77875642 has 24 divisors (see below), whose sum is σ = 132784596. Its totient is φ = 34046784.

The previous prime is 77875619. The next prime is 77875649. The reversal of 77875642 is 24657877.

It can be written as a sum of positive squares in 2 ways, for example, as 76055841 + 1819801 = 8721^2 + 1349^2 .

It is a junction number, because it is equal to n+sod(n) for n = 77875592 and 77875601.

It is not an unprimeable number, because it can be changed into a prime (77875649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5238 + ... + 13534.

Almost surely, 2^77875642 is an apocalyptic number.

77875642 is a deficient number, since it is larger than the sum of its proper divisors (54908954).

77875642 is a wasteful number, since it uses less digits than its factorization.

77875642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8350 (or 8331 counting only the distinct ones).

The product of its digits is 658560, while the sum is 46.

The square root of 77875642 is about 8824.7176725377. The cubic root of 77875642 is about 427.0386793168.

The spelling of 77875642 in words is "seventy-seven million, eight hundred seventy-five thousand, six hundred forty-two".