649729994 has 4 divisors (see below), whose sum is σ = 974594994. Its totient is φ = 324864996.

The previous prime is 649729981. The next prime is 649730041. The reversal of 649729994 is 499927946.

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., 628153969 + 21576025 = 25063^2 + 4645^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162432497 + ... + 162432500.

Almost surely, 2^649729994 is an apocalyptic number.

649729994 is a deficient number, since it is larger than the sum of its proper divisors (324865000).

649729994 is a wasteful number, since it uses less digits than its factorization.

649729994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324864999.

The product of its digits is 8817984, while the sum is 59.

The square root of 649729994 is about 25489.8017646274. The cubic root of 649729994 is about 866.1191452646.

The spelling of 649729994 in words is "six hundred forty-nine million, seven hundred twenty-nine thousand, nine hundred ninety-four".