1620557632 has 28 divisors (see below), whose sum is σ = 3238947040. Its totient is φ = 804445056.

The previous prime is 1620557597. The next prime is 1620557647. The reversal of 1620557632 is 2367550261.

It is a junction number, because it is equal to n+sod(n) for n = 1620557591 and 1620557600.

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, 82188 + ... + 99979.

It is an arithmetic number, because the mean of its divisors is an integer number (115676680).

Almost surely, 2^1620557632 is an apocalyptic number.

It is an amenable number.

1620557632 is a deficient number, since it is larger than the sum of its proper divisors (1618389408).

1620557632 is a wasteful number, since it uses less digits than its factorization.

1620557632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182318 (or 182308 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 1620557632 is about 40256.1502381934. The cubic root of 1620557632 is about 1174.5950334024.

It can be divided in two parts, 16205 and 57632, that added together give a palindrome (73837).

The spelling of 1620557632 in words is "one billion, six hundred twenty million, five hundred fifty-seven thousand, six hundred thirty-two".