1629311220 has 96 divisors (see below), whose sum is σ = 5152170240. Its totient is φ = 427351680.

The previous prime is 1629311219. The next prime is 1629311261. The reversal of 1629311220 is 221139261.

1629311220 is a `hidden beast` number, since 1 + 629 + 3 + 1 + 12 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8209 + ... + 57671.

It is an arithmetic number, because the mean of its divisors is an integer number (53668440).

Almost surely, 2^1629311220 is an apocalyptic number.

1629311220 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 1629311220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2576085120).

1629311220 is an abundant number, since it is smaller than the sum of its proper divisors (3522859020).

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

1629311220 is a wasteful number, since it uses less digits than its factorization.

1629311220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49542 (or 49534 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1629311220 is about 40364.7274238288. The cubic root of 1629311220 is about 1176.7061304789.

The spelling of 1629311220 in words is "one billion, six hundred twenty-nine million, three hundred eleven thousand, two hundred twenty".