1620221010 has 64 divisors (see below), whose sum is σ = 4234377600. Its totient is φ = 395200512.

The previous prime is 1620220999. The next prime is 1620221011. The reversal of 1620221010 is 101220261.

It is a super-2 number, since 2×1620221010² = 5250232242490840200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (1620221011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32479 + ... + 65538.

It is an arithmetic number, because the mean of its divisors is an integer number (66162150).

Almost surely, 2^1620221010 is an apocalyptic number.

1620221010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1620221010 is an abundant number, since it is smaller than the sum of its proper divisors (2614156590).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620221010 is a wasteful number, since it uses less digits than its factorization.

1620221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98075.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1620221010 is about 40251.9690201610. The cubic root of 1620221010 is about 1174.5136988663.

Adding to 1620221010 its reverse (101220261), we get a palindrome (1721441271).

The spelling of 1620221010 in words is "one billion, six hundred twenty million, two hundred twenty-one thousand, ten".