1620487634 has 16 divisors (see below), whose sum is σ = 2575524600. Its totient is φ = 762046464.

The previous prime is 1620487633. The next prime is 1620487639. The reversal of 1620487634 is 4367840261.

It can be written as a sum of positive squares in 4 ways, for example, as 822255625 + 798232009 = 28675^2 + 28253^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1620487591 and 1620487600.

It is not an unprimeable number, because it can be changed into a prime (1620487633) 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, 34622 + ... + 66630.

Almost surely, 2^1620487634 is an apocalyptic number.

1620487634 is a deficient number, since it is larger than the sum of its proper divisors (955036966).

1620487634 is a wasteful number, since it uses less digits than its factorization.

1620487634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33517.

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 1620487634 is about 40255.2808212786. The cubic root of 1620487634 is about 1174.5781214281.

The spelling of 1620487634 in words is "one billion, six hundred twenty million, four hundred eighty-seven thousand, six hundred thirty-four".