1818691680 has 96 divisors (see below), whose sum is σ = 6169582944. Its totient is φ = 447676416.

The previous prime is 1818691619. The next prime is 1818691687. The reversal of 1818691680 is 861968181.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1818691687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139489 + ... + 151968.

It is an arithmetic number, because the mean of its divisors is an integer number (64266489).

Almost surely, 2^1818691680 is an apocalyptic number.

1818691680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1818691680 is an abundant number, since it is smaller than the sum of its proper divisors (4350891264).

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

1818691680 is a wasteful number, since it uses less digits than its factorization.

1818691680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291488 (or 291480 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 48.

The square root of 1818691680 is about 42646.1215118093. The cubic root of 1818691680 is about 1220.6365217363.

The spelling of 1818691680 in words is "one billion, eight hundred eighteen million, six hundred ninety-one thousand, six hundred eighty".