1620634544 has 10 divisors (see below), whose sum is σ = 3139979460. Its totient is φ = 810317264.

The previous prime is 1620634517. The next prime is 1620634549. The reversal of 1620634544 is 4454360261.

It is not an unprimeable number, because it can be changed into a prime (1620634549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50644814 + ... + 50644845.

It is an arithmetic number, because the mean of its divisors is an integer number (313997946).

Almost surely, 2^1620634544 is an apocalyptic number.

It is an amenable number.

1620634544 is a deficient number, since it is larger than the sum of its proper divisors (1519344916).

1620634544 is a wasteful number, since it uses less digits than its factorization.

1620634544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101289667 (or 101289661 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 1620634544 is about 40257.1055094626. The cubic root of 1620634544 is about 1174.6136152828.

The spelling of 1620634544 in words is "one billion, six hundred twenty million, six hundred thirty-four thousand, five hundred forty-four".