1620987552 has 120 divisors (see below), whose sum is σ = 4781633472. Its totient is φ = 538704000.

The previous prime is 1620987541. The next prime is 1620987569. The reversal of 1620987552 is 2557890261.

1620987552 is a `hidden beast` number, since 1 + 6 + 2 + 0 + 98 + 7 + 552 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1620987498 and 1620987507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1116427 + ... + 1117877.

Almost surely, 2^1620987552 is an apocalyptic number.

1620987552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620987552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2390816736).

1620987552 is an abundant number, since it is smaller than the sum of its proper divisors (3160645920).

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

1620987552 is a wasteful number, since it uses less digits than its factorization.

1620987552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904 (or 1887 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 1620987552 is about 40261.4896892800. The cubic root of 1620987552 is about 1174.6988942047.

The spelling of 1620987552 in words is "one billion, six hundred twenty million, nine hundred eighty-seven thousand, five hundred fifty-two".