1861535328 has 48 divisors (see below), whose sum is σ = 4891299840. Its totient is φ = 619906176.

The previous prime is 1861535321. The next prime is 1861535329. The reversal of 1861535328 is 8235351681.

1861535328 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1861535328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861535321) 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, 95433 + ... + 113271.

It is an arithmetic number, because the mean of its divisors is an integer number (101902080).

Almost surely, 2^1861535328 is an apocalyptic number.

It is an amenable number.

1861535328 is an abundant number, since it is smaller than the sum of its proper divisors (3029764512).

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

1861535328 is a wasteful number, since it uses less digits than its factorization.

1861535328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18939 (or 18931 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

The square root of 1861535328 is about 43145.5134168085. The cubic root of 1861535328 is about 1230.1472333501.

The spelling of 1861535328 in words is "one billion, eight hundred sixty-one million, five hundred thirty-five thousand, three hundred twenty-eight".