117772778 has 4 divisors (see below), whose sum is σ = 176659170. Its totient is φ = 58886388.

The previous prime is 117772769. The next prime is 117772783. The reversal of 117772778 is 877277711.

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., 111028369 + 6744409 = 10537^2 + 2597^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29443193 + ... + 29443196.

Almost surely, 2^117772778 is an apocalyptic number.

117772778 is a deficient number, since it is larger than the sum of its proper divisors (58886392).

117772778 is an equidigital number, since it uses as much as digits as its factorization.

117772778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58886391.

The product of its digits is 268912, while the sum is 47.

The square root of 117772778 is about 10852.3167111912. The cubic root of 117772778 is about 490.1717820583.

It can be divided in two parts, 11 and 7772778, that multiplied together give a palindrome (85500558).

The spelling of 117772778 in words is "one hundred seventeen million, seven hundred seventy-two thousand, seven hundred seventy-eight".