1631328 has 24 divisors (see below), whose sum is σ = 4282488. Its totient is φ = 543744.

The previous prime is 1631309. The next prime is 1631341. The reversal of 1631328 is 8231361.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×1631328² = 5322462087168, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1631298 and 1631307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8401 + ... + 8592.

It is an arithmetic number, because the mean of its divisors is an integer number (178437).

2^1631328 is an apocalyptic number.

It is an amenable number.

1631328 is an abundant number, since it is smaller than the sum of its proper divisors (2651160).

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

1631328 is a wasteful number, since it uses less digits than its factorization.

1631328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17006 (or 16998 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 1631328 is about 1277.2345125309. The cubic root of 1631328 is about 117.7191443712.

Adding to 1631328 its reverse (8231361), we get a palindrome (9862689).

The spelling of 1631328 in words is "one million, six hundred thirty-one thousand, three hundred twenty-eight".