649724538 has 8 divisors (see below), whose sum is σ = 1299449088. Its totient is φ = 216574844.

The previous prime is 649724501. The next prime is 649724557. The reversal of 649724538 is 835427946.

It is a sphenic number, since it is the product of 3 distinct primes.

649724538 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54143706 + ... + 54143717.

It is an arithmetic number, because the mean of its divisors is an integer number (162431136).

Almost surely, 2^649724538 is an apocalyptic number.

649724538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649724538 is a wasteful number, since it uses less digits than its factorization.

649724538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108287428.

The product of its digits is 1451520, while the sum is 48.

The square root of 649724538 is about 25489.6947412087. The cubic root of 649724538 is about 866.1167208938.

The spelling of 649724538 in words is "six hundred forty-nine million, seven hundred twenty-four thousand, five hundred thirty-eight".