1650129408 has 140 divisors (see below), whose sum is σ = 4944410658. Its totient is φ = 549918720.

The previous prime is 1650129407. The next prime is 1650129431. The reversal of 1650129408 is 8049210561.

It can be written as a sum of positive squares in only one way, i.e., 1164720384 + 485409024 = 34128^2 + 22032^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1650129407) 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 13 ways as a sum of consecutive naturals, for example, 371038 + ... + 375458.

Almost surely, 2^1650129408 is an apocalyptic number.

1650129408 is a gapful number since it is divisible by the number (18) 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 1650129408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2472205329).

1650129408 is an abundant number, since it is smaller than the sum of its proper divisors (3294281250).

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

1650129408 is an frugal number, since it uses more digits than its factorization.

1650129408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4457 (or 4426 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1650129408 is about 40621.7848943150. The cubic root of 1650129408 is about 1181.6966419834.

Adding to 1650129408 its reverse (8049210561), we get a palindrome (9699339969).

The spelling of 1650129408 in words is "one billion, six hundred fifty million, one hundred twenty-nine thousand, four hundred eight".