1620530245 has 8 divisors (see below), whose sum is σ = 1966486680. Its totient is φ = 1281857280.

The previous prime is 1620530243. The next prime is 1620530291. The reversal of 1620530245 is 5420350261.

It can be written as a sum of positive squares in 4 ways, for example, as 66357316 + 1554172929 = 8146^2 + 39423^2 .

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

It is not a de Polignac number, because 1620530245 - 2¹ = 1620530243 is a prime.

It is a super-2 number, since 2×1620530245² = 5252236549919520050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620530243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1820376 + ... + 1821265.

It is an arithmetic number, because the mean of its divisors is an integer number (245810835).

Almost surely, 2^1620530245 is an apocalyptic number.

It is an amenable number.

1620530245 is a deficient number, since it is larger than the sum of its proper divisors (345956435).

1620530245 is an equidigital number, since it uses as much as digits as its factorization.

1620530245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3641735.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 1620530245 is about 40255.8100775528. The cubic root of 1620530245 is about 1174.5884165822.

The spelling of 1620530245 in words is "one billion, six hundred twenty million, five hundred thirty thousand, two hundred forty-five".