77708242 has 4 divisors (see below), whose sum is σ = 116562366. Its totient is φ = 38854120.

The previous prime is 77708153. The next prime is 77708261. The reversal of 77708242 is 24280777.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24280777 = 17 ⋅1428281.

It can be written as a sum of positive squares in only one way, i.e., 62583921 + 15124321 = 7911^2 + 3889^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19427059 + ... + 19427062.

Almost surely, 2^77708242 is an apocalyptic number.

77708242 is a deficient number, since it is larger than the sum of its proper divisors (38854124).

77708242 is a wasteful number, since it uses less digits than its factorization.

77708242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38854123.

The product of its (nonzero) digits is 43904, while the sum is 37.

The square root of 77708242 is about 8815.2278473106. The cubic root of 77708242 is about 426.7324750652.

The spelling of 77708242 in words is "seventy-seven million, seven hundred eight thousand, two hundred forty-two".