1102128778 has 8 divisors (see below), whose sum is σ = 1653334020. Its totient is φ = 551017440.

The previous prime is 1102128773. The next prime is 1102128817. The reversal of 1102128778 is 8778212011.

It can be written as a sum of positive squares in 2 ways, for example, as 980754489 + 121374289 = 31317^2 + 11017^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1102128773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34948 + ... + 58528.

Almost surely, 2^1102128778 is an apocalyptic number.

1102128778 is a deficient number, since it is larger than the sum of its proper divisors (551205242).

1102128778 is a wasteful number, since it uses less digits than its factorization.

1102128778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46952.

The product of its (nonzero) digits is 12544, while the sum is 37.

The square root of 1102128778 is about 33198.3249276225. The cubic root of 1102128778 is about 1032.9455939873.

The spelling of 1102128778 in words is "one billion, one hundred two million, one hundred twenty-eight thousand, seven hundred seventy-eight".