77831831252738 has 4 divisors (see below), whose sum is σ = 116747746879110. Its totient is φ = 38915915626368.

The previous prime is 77831831252731. The next prime is 77831831252849. The reversal of 77831831252738 is 83725213813877.

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., 44672741310289 + 33159089942449 = 6683767^2 + 5758393^2 .

It is not an unprimeable number, because it can be changed into a prime (77831831252731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19457957813183 + ... + 19457957813186.

Almost surely, 2^{77831831252738} is an apocalyptic number.

77831831252738 is a deficient number, since it is larger than the sum of its proper divisors (38915915626372).

77831831252738 is a wasteful number, since it uses less digits than its factorization.

77831831252738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38915915626371.

The product of its digits is 94832640, while the sum is 65.

The spelling of 77831831252738 in words is "seventy-seven trillion, eight hundred thirty-one billion, eight hundred thirty-one million, two hundred fifty-two thousand, seven hundred thirty-eight".