1620431332 has 24 divisors (see below), whose sum is σ = 3059587832. Its totient is φ = 746496000.

The previous prime is 1620431303. The next prime is 1620431333. The reversal of 1620431332 is 2331340261.

It can be written as a sum of positive squares in 4 ways, for example, as 420086016 + 1200345316 = 20496^2 + 34646^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1620431297 and 1620431306.

It is not an unprimeable number, because it can be changed into a prime (1620431333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669 + ... + 56932.

Almost surely, 2^1620431332 is an apocalyptic number.

It is an amenable number.

1620431332 is a deficient number, since it is larger than the sum of its proper divisors (1439156500).

1620431332 is a wasteful number, since it uses less digits than its factorization.

1620431332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58159 (or 58157 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 1620431332 is about 40254.5815032277. The cubic root of 1620431332 is about 1174.5645181436.

Adding to 1620431332 its reverse (2331340261), we get a palindrome (3951771593).

The spelling of 1620431332 in words is "one billion, six hundred twenty million, four hundred thirty-one thousand, three hundred thirty-two".