1816860864 has 336 divisors, whose sum is σ = 6276929280. Its totient is φ = 452874240.

The previous prime is 1816860823. The next prime is 1816860869. The reversal of 1816860864 is 4680686181.

It is a tau number, because it is divible by the number of its divisors (336).

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 (1816860869) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4315374 + ... + 4315794.

Almost surely, 2^1816860864 is an apocalyptic number.

1816860864 is a gapful number since it is divisible by the number (14) 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 1816860864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3138464640).

1816860864 is an abundant number, since it is smaller than the sum of its proper divisors (4460068416).

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

1816860864 is a wasteful number, since it uses less digits than its factorization.

1816860864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 48.

The square root of 1816860864 is about 42624.6508959311. The cubic root of 1816860864 is about 1220.2267929177.

The spelling of 1816860864 in words is "one billion, eight hundred sixteen million, eight hundred sixty thousand, eight hundred sixty-four".