87778933738 has 8 divisors (see below), whose sum is σ = 131679038340. Its totient is φ = 43885920960.

The previous prime is 87778933727. The next prime is 87778933757. The reversal of 87778933738 is 83733987778.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 81769118209 + 6009815529 = 285953^2 + 77523^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1741903 + ... + 1791586.

Almost surely, 2^87778933738 is an apocalyptic number.

87778933738 is a deficient number, since it is larger than the sum of its proper divisors (43900104602).

87778933738 is a wasteful number, since it uses less digits than its factorization.

87778933738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545912.

The product of its digits is 298722816, while the sum is 70.

The spelling of 87778933738 in words is "eighty-seven billion, seven hundred seventy-eight million, nine hundred thirty-three thousand, seven hundred thirty-eight".