1620742208 has 14 divisors (see below), whose sum is σ = 3216160446. Its totient is φ = 810371072.

The previous prime is 1620742171. The next prime is 1620742241. The reversal of 1620742208 is 8022470261.

It can be written as a sum of positive squares in only one way, i.e., 1615396864 + 5345344 = 40192^2 + 2312^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12661985 + ... + 12662112.

Almost surely, 2^1620742208 is an apocalyptic number.

It is an amenable number.

1620742208 is a deficient number, since it is larger than the sum of its proper divisors (1595418238).

1620742208 is an equidigital number, since it uses as much as digits as its factorization.

1620742208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25324109 (or 25324099 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 1620742208 is about 40258.4426921857. The cubic root of 1620742208 is about 1174.6396258353.

The spelling of 1620742208 in words is "one billion, six hundred twenty million, seven hundred forty-two thousand, two hundred eight".