649975 has 6 divisors (see below), whose sum is σ = 806000. Its totient is φ = 519960.

The previous prime is 649969. The next prime is 649981. The reversal of 649975 is 579946.

It is an interprime number because it is at equal distance from previous prime (649969) and next prime (649981).

It is not a de Polignac number, because 649975 - 2¹⁹ = 125687 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12975 + ... + 13024.

2⁶⁴⁹⁹⁷⁵ is an apocalyptic number.

649975 is a deficient number, since it is larger than the sum of its proper divisors (156025).

649975 is a wasteful number, since it uses less digits than its factorization.

649975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26009 (or 26004 counting only the distinct ones).

The product of its digits is 68040, while the sum is 40.

The square root of 649975 is about 806.2102703389. The cubic root of 649975 is about 86.6227999569.

The spelling of 649975 in words is "six hundred forty-nine thousand, nine hundred seventy-five".