651864 has 32 divisors (see below), whose sum is σ = 1649520. Its totient is φ = 214656.

The previous prime is 651863. The next prime is 651869. The reversal of 651864 is 468156.

651864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3682 + ... + 3854.

2⁶⁵¹⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

651864 is an abundant number, since it is smaller than the sum of its proper divisors (997656).

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

651864 is a wasteful number, since it uses less digits than its factorization.

651864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 335 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 651864 is about 807.3809509767. The cubic root of 651864 is about 86.7066350822.

The spelling of 651864 in words is "six hundred fifty-one thousand, eight hundred sixty-four".