649920158 has 4 divisors (see below), whose sum is σ = 974880240. Its totient is φ = 324960078.

The previous prime is 649920121. The next prime is 649920197. The reversal of 649920158 is 851029946.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 162480038 + ... + 162480041.

It is an arithmetic number, because the mean of its divisors is an integer number (243720060).

Almost surely, 2^649920158 is an apocalyptic number.

649920158 is a deficient number, since it is larger than the sum of its proper divisors (324960082).

649920158 is a wasteful number, since it uses less digits than its factorization.

649920158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324960081.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 649920158 is about 25493.5316894306. The cubic root of 649920158 is about 866.2036360616.

The spelling of 649920158 in words is "six hundred forty-nine million, nine hundred twenty thousand, one hundred fifty-eight".