1557664 has 12 divisors (see below), whose sum is σ = 3066714. Its totient is φ = 778816.

The previous prime is 1557653. The next prime is 1557667. The reversal of 1557664 is 4667551.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1299600 + 258064 = 1140^2 + 508^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1557667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24307 + ... + 24370.

2^1557664 is an apocalyptic number.

It is an amenable number.

1557664 is a deficient number, since it is larger than the sum of its proper divisors (1509050).

1557664 is an equidigital number, since it uses as much as digits as its factorization.

1557664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48687 (or 48679 counting only the distinct ones).

The product of its digits is 25200, while the sum is 34.

The square root of 1557664 is about 1248.0641009179. The cubic root of 1557664 is about 115.9198812599.

The spelling of 1557664 in words is "one million, five hundred fifty-seven thousand, six hundred sixty-four".