651604 has 6 divisors (see below), whose sum is σ = 1140314. Its totient is φ = 325800.

The previous prime is 651587. The next prime is 651617. The reversal of 651604 is 406156.

651604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 490000 + 161604 = 700^2 + 402^2 .

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, 81447 + ... + 81454.

2⁶⁵¹⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

651604 is a deficient number, since it is larger than the sum of its proper divisors (488710).

651604 is a wasteful number, since it uses less digits than its factorization.

651604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162905 (or 162903 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 651604 is about 807.2199204678. The cubic root of 651604 is about 86.6951057228.

The spelling of 651604 in words is "six hundred fifty-one thousand, six hundred four".