1621087564 has 48 divisors (see below), whose sum is σ = 3142250496. Its totient is φ = 727865600.

The previous prime is 1621087499. The next prime is 1621087577. The reversal of 1621087564 is 4657801261.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 766869 + ... + 768979.

It is an arithmetic number, because the mean of its divisors is an integer number (65463552).

Almost surely, 2^1621087564 is an apocalyptic number.

It is an amenable number.

1621087564 is a deficient number, since it is larger than the sum of its proper divisors (1521162932).

1621087564 is a wasteful number, since it uses less digits than its factorization.

1621087564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646 (or 2644 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 1621087564 is about 40262.7317006683. The cubic root of 1621087564 is about 1174.7230526402.

The spelling of 1621087564 in words is "one billion, six hundred twenty-one million, eighty-seven thousand, five hundred sixty-four".