1620459490 has 32 divisors (see below), whose sum is σ = 3176515440. Its totient is φ = 591596544.

The previous prime is 1620459487. The next prime is 1620459493. The reversal of 1620459490 is 949540261.

It is an interprime number because it is at equal distance from previous prime (1620459487) and next prime (1620459493).

It can be written as a sum of positive squares in 8 ways, for example, as 12369289 + 1608090201 = 3517^2 + 40101^2 .

It is not an unprimeable number, because it can be changed into a prime (1620459493) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58459 + ... + 81598.

Almost surely, 2^1620459490 is an apocalyptic number.

1620459490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620459490 is a deficient number, since it is larger than the sum of its proper divisors (1556055950).

1620459490 is a wasteful number, since it uses less digits than its factorization.

1620459490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140166.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 1620459490 is about 40254.9312507176. The cubic root of 1620459490 is about 1174.5713215165.

The spelling of 1620459490 in words is "one billion, six hundred twenty million, four hundred fifty-nine thousand, four hundred ninety".