1612537220 has 96 divisors (see below), whose sum is σ = 4089657600. Its totient is φ = 521731584.

The previous prime is 1612537207. The next prime is 1612537229. The reversal of 1612537220 is 227352161.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1612537229) 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 31 ways as a sum of consecutive naturals, for example, 778346 + ... + 780414.

It is an arithmetic number, because the mean of its divisors is an integer number (42600600).

Almost surely, 2^1612537220 is an apocalyptic number.

1612537220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1612537220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2044828800).

1612537220 is an abundant number, since it is smaller than the sum of its proper divisors (2477120380).

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

1612537220 is a wasteful number, since it uses less digits than its factorization.

1612537220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2397 (or 2395 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 1612537220 is about 40156.4094510453. The cubic root of 1612537220 is about 1172.6540717667.

Adding to 1612537220 its reverse (227352161), we get a palindrome (1839889381).

The spelling of 1612537220 in words is "one billion, six hundred twelve million, five hundred thirty-seven thousand, two hundred twenty".