1820778612 has 48 divisors (see below), whose sum is σ = 4288660992. Its totient is φ = 601211520.

The previous prime is 1820778593. The next prime is 1820778613. The reversal of 1820778612 is 2168770281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820778613) 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, 701437 + ... + 704027.

It is an arithmetic number, because the mean of its divisors is an integer number (89347104).

Almost surely, 2^1820778612 is an apocalyptic number.

1820778612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1820778612 is an abundant number, since it is smaller than the sum of its proper divisors (2467882380).

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

1820778612 is a wasteful number, since it uses less digits than its factorization.

1820778612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128 (or 3126 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 1820778612 is about 42670.5825130147. The cubic root of 1820778612 is about 1221.1032329989.

The spelling of 1820778612 in words is "one billion, eight hundred twenty million, seven hundred seventy-eight thousand, six hundred twelve".