2106778402 has 4 divisors (see below), whose sum is σ = 3160167606. Its totient is φ = 1053389200.

The previous prime is 2106778391. The next prime is 2106778417. The reversal of 2106778402 is 2048776012.

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., 1818084321 + 288694081 = 42639^2 + 16991^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 526694599 + ... + 526694602.

Almost surely, 2^2106778402 is an apocalyptic number.

2106778402 is a deficient number, since it is larger than the sum of its proper divisors (1053389204).

2106778402 is a wasteful number, since it uses less digits than its factorization.

2106778402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053389203.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 2106778402 is about 45899.6557939164. The cubic root of 2106778402 is about 1281.9555074719.

The spelling of 2106778402 in words is "two billion, one hundred six million, seven hundred seventy-eight thousand, four hundred two".