1861772080 has 40 divisors (see below), whose sum is σ = 4946995872. Its totient is φ = 638321664.

The previous prime is 1861772069. The next prime is 1861772083. The reversal of 1861772080 is 802771681.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (1861772083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1661737 + ... + 1662856.

Almost surely, 2^1861772080 is an apocalyptic number.

1861772080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1861772080 is an abundant number, since it is smaller than the sum of its proper divisors (3085223792).

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

1861772080 is a wasteful number, since it uses less digits than its factorization.

1861772080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3324613 (or 3324607 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 40.

The square root of 1861772080 is about 43148.2569752244. The cubic root of 1861772080 is about 1230.1993816078.

The spelling of 1861772080 in words is "one billion, eight hundred sixty-one million, seven hundred seventy-two thousand, eighty".