2644149394 has 4 divisors (see below), whose sum is σ = 3966224094. Its totient is φ = 1322074696.

The previous prime is 2644149379. The next prime is 2644149401. The reversal of 2644149394 is 4939414462.

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., 1621109169 + 1023040225 = 40263^2 + 31985^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661037347 + ... + 661037350.

Almost surely, 2^2644149394 is an apocalyptic number.

2644149394 is a deficient number, since it is larger than the sum of its proper divisors (1322074700).

2644149394 is a wasteful number, since it uses less digits than its factorization.

2644149394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322074699.

The product of its digits is 746496, while the sum is 46.

The square root of 2644149394 is about 51421.2931964959. The cubic root of 2644149394 is about 1382.8083596150.

The spelling of 2644149394 in words is "two billion, six hundred forty-four million, one hundred forty-nine thousand, three hundred ninety-four".