1621063746 has 32 divisors (see below), whose sum is σ = 3679015680. Its totient is φ = 528856848.

The previous prime is 1621063739. The next prime is 1621063771. The reversal of 1621063746 is 6473601261.

It is a happy number.

1621063746 is a `hidden beast` number, since 1 + 6 + 2 + 10 + 637 + 4 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1621063746.

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, 316821 + ... + 321896.

It is an arithmetic number, because the mean of its divisors is an integer number (114969240).

Almost surely, 2^1621063746 is an apocalyptic number.

1621063746 is an abundant number, since it is smaller than the sum of its proper divisors (2057951934).

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

1621063746 is a wasteful number, since it uses less digits than its factorization.

1621063746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638775 (or 638769 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 1621063746 is about 40262.4359173660. The cubic root of 1621063746 is about 1174.7172993646.

The spelling of 1621063746 in words is "one billion, six hundred twenty-one million, sixty-three thousand, seven hundred forty-six".