1663624 has 8 divisors (see below), whose sum is σ = 3119310. Its totient is φ = 831808.

The previous prime is 1663619. The next prime is 1663681. The reversal of 1663624 is 4263661.

It can be written as a sum of positive squares in only one way, i.e., 1562500 + 101124 = 1250^2 + 318^2 .

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

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1663592 and 1663601.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103969 + ... + 103984.

2^1663624 is an apocalyptic number.

It is an amenable number.

1663624 is a deficient number, since it is larger than the sum of its proper divisors (1455686).

1663624 is a wasteful number, since it uses less digits than its factorization.

1663624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207959 (or 207955 counting only the distinct ones).

The product of its digits is 5184, while the sum is 28.

The square root of 1663624 is about 1289.8154906807. The cubic root of 1663624 is about 118.4909165950.

The spelling of 1663624 in words is "one million, six hundred sixty-three thousand, six hundred twenty-four".