649702874 has 4 divisors (see below), whose sum is σ = 974554314. Its totient is φ = 324851436.

The previous prime is 649702871. The next prime is 649702901. The reversal of 649702874 is 478207946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 478207946 = 2 ⋅239103973.

It can be written as a sum of positive squares in only one way, i.e., 634687249 + 15015625 = 25193^2 + 3875^2 .

It is a super-2 number, since 2×649702874² = 844227648967719752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649702871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162425717 + ... + 162425720.

Almost surely, 2^649702874 is an apocalyptic number.

649702874 is a deficient number, since it is larger than the sum of its proper divisors (324851440).

649702874 is a wasteful number, since it uses less digits than its factorization.

649702874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324851439.

The product of its (nonzero) digits is 677376, while the sum is 47.

The square root of 649702874 is about 25489.2697816159. The cubic root of 649702874 is about 866.1070943725.

The spelling of 649702874 in words is "six hundred forty-nine million, seven hundred two thousand, eight hundred seventy-four".