1620660698 has 8 divisors (see below), whose sum is σ = 2435092308. Its totient is φ = 808963264.

The previous prime is 1620660667. The next prime is 1620660703. The reversal of 1620660698 is 8960660261.

It can be written as a sum of positive squares in 2 ways, for example, as 1430579329 + 190081369 = 37823^2 + 13787^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 682061 + ... + 684432.

Almost surely, 2^1620660698 is an apocalyptic number.

1620660698 is a deficient number, since it is larger than the sum of its proper divisors (814431610).

1620660698 is a wasteful number, since it uses less digits than its factorization.

1620660698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367088.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 1620660698 is about 40257.4303452170. The cubic root of 1620660698 is about 1174.6199339352.

The spelling of 1620660698 in words is "one billion, six hundred twenty million, six hundred sixty thousand, six hundred ninety-eight".