1328332731 has 32 divisors (see below), whose sum is σ = 2122260480. Its totient is φ = 729511200.

The previous prime is 1328332721. The next prime is 1328332771. The reversal of 1328332731 is 1372338231.

It is not a de Polignac number, because 1328332731 - 2⁹ = 1328332219 is a prime.

It is a super-2 number, since 2×1328332731² = 3528935688491836722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 1328332692 and 1328332701.

It is not an unprimeable number, because it can be changed into a prime (1328332711) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31635 + ... + 60476.

It is an arithmetic number, because the mean of its divisors is an integer number (66320640).

Almost surely, 2^1328332731 is an apocalyptic number.

1328332731 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1328332731 is a deficient number, since it is larger than the sum of its proper divisors (793927749).

1328332731 is a wasteful number, since it uses less digits than its factorization.

1328332731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92167.

The product of its digits is 18144, while the sum is 33.

The square root of 1328332731 is about 36446.2992771557. The cubic root of 1328332731 is about 1099.2647237782.

The spelling of 1328332731 in words is "one billion, three hundred twenty-eight million, three hundred thirty-two thousand, seven hundred thirty-one".