1618766220 has 96 divisors (see below), whose sum is σ = 4744438272. Its totient is φ = 411609088.

The previous prime is 1618766213. The next prime is 1618766239. The reversal of 1618766220 is 226678161.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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, 485479 + ... + 488801.

It is an arithmetic number, because the mean of its divisors is an integer number (49421232).

Almost surely, 2^1618766220 is an apocalyptic number.

1618766220 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 1618766220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2372219136).

1618766220 is an abundant number, since it is smaller than the sum of its proper divisors (3125672052).

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

1618766220 is a wasteful number, since it uses less digits than its factorization.

1618766220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3711 (or 3709 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 1618766220 is about 40233.8939204249. The cubic root of 1618766220 is about 1174.1620632085.

The spelling of 1618766220 in words is "one billion, six hundred eighteen million, seven hundred sixty-six thousand, two hundred twenty".