619664 has 10 divisors (see below), whose sum is σ = 1200630. Its totient is φ = 309824.

The previous prime is 619657. The next prime is 619669. The reversal of 619664 is 466916.

It can be written as a sum of positive squares in only one way, i.e., 369664 + 250000 = 608^2 + 500^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 619664.

It is not an unprimeable number, because it can be changed into a prime (619669) by changing a digit.

619664 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, 19349 + ... + 19380.

It is an arithmetic number, because the mean of its divisors is an integer number (120063).

2⁶¹⁹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

619664 is a deficient number, since it is larger than the sum of its proper divisors (580966).

619664 is a wasteful number, since it uses less digits than its factorization.

619664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38737 (or 38731 counting only the distinct ones).

The product of its digits is 7776, while the sum is 32.

The square root of 619664 is about 787.1873982731. The cubic root of 619664 is about 85.2547834022.

The spelling of 619664 in words is "six hundred nineteen thousand, six hundred sixty-four".