649624 has 8 divisors (see below), whose sum is σ = 1218060. Its totient is φ = 324808.

The previous prime is 649619. The next prime is 649631. The reversal of 649624 is 426946.

649624 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×649624² = 844022682752, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

649624 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40594 + ... + 40609.

2⁶⁴⁹⁶²⁴ is an apocalyptic number.

It is an amenable number.

649624 is a deficient number, since it is larger than the sum of its proper divisors (568436).

649624 is a wasteful number, since it uses less digits than its factorization.

649624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81209 (or 81205 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 649624 is about 805.9925557969. The cubic root of 649624 is about 86.6072044455.

The spelling of 649624 in words is "six hundred forty-nine thousand, six hundred twenty-four".