1812299664 has 80 divisors (see below), whose sum is σ = 5495247488. Its totient is φ = 503801856.

The previous prime is 1812299633. The next prime is 1812299669. The reversal of 1812299664 is 4669922181.

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

It is not an unprimeable number, because it can be changed into a prime (1812299669) 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, 60457 + ... + 85320.

Almost surely, 2^1812299664 is an apocalyptic number.

1812299664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1812299664 is an abundant number, since it is smaller than the sum of its proper divisors (3682947824).

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

1812299664 is a wasteful number, since it uses less digits than its factorization.

1812299664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145832 (or 145826 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 1812299664 is about 42571.1130227999. The cubic root of 1812299664 is about 1219.2048173045.

It can be divided in two parts, 1812 and 299664, that added together give a triangular number (301476 = T₇₇₆).

The spelling of 1812299664 in words is "one billion, eight hundred twelve million, two hundred ninety-nine thousand, six hundred sixty-four".