1620706564 has 9 divisors (see below), whose sum is σ = 2836377397. Its totient is φ = 810313024.

The previous prime is 1620706547. The next prime is 1620706573. The reversal of 1620706564 is 4656070261.

It is a happy number.

The square root of 1620706564 is 40258.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1454812164 + 165894400 = 38142^2 + 12880^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 70452 + ... + 90580.

Almost surely, 2^1620706564 is an apocalyptic number.

1620706564 is the 40258-th square number.

It is an amenable number.

1620706564 is a deficient number, since it is larger than the sum of its proper divisors (1215670833).

1620706564 is an frugal number, since it uses more digits than its factorization.

1620706564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40262 (or 20131 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The cubic root of 1620706564 is about 1174.6310147267.

The spelling of 1620706564 in words is "one billion, six hundred twenty million, seven hundred six thousand, five hundred sixty-four".