1620218258 has 4 divisors (see below), whose sum is σ = 2430327390. Its totient is φ = 810109128.

The previous prime is 1620218231. The next prime is 1620218267. The reversal of 1620218258 is 8528120261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1327363489 + 292854769 = 36433^2 + 17113^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405054563 + ... + 405054566.

Almost surely, 2^1620218258 is an apocalyptic number.

1620218258 is a deficient number, since it is larger than the sum of its proper divisors (810109132).

1620218258 is an equidigital number, since it uses as much as digits as its factorization.

1620218258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810109131.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 1620218258 is about 40251.9348354834. The cubic root of 1620218258 is about 1174.5130338823.

The spelling of 1620218258 in words is "one billion, six hundred twenty million, two hundred eighteen thousand, two hundred fifty-eight".