861501540 has 48 divisors (see below), whose sum is σ = 2463535872. Its totient is φ = 224845056.

The previous prime is 861501533. The next prime is 861501559. The reversal of 861501540 is 45105168.

861501540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 861501498 and 861501507.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149929 + ... + 155568.

It is an arithmetic number, because the mean of its divisors is an integer number (51323664).

Almost surely, 2^861501540 is an apocalyptic number.

It is an amenable number.

861501540 is an abundant number, since it is smaller than the sum of its proper divisors (1602034332).

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

861501540 is a wasteful number, since it uses less digits than its factorization.

861501540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305556 (or 305554 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 861501540 is about 29351.3464767802. The cubic root of 861501540 is about 951.5216758298.

The spelling of 861501540 in words is "eight hundred sixty-one million, five hundred one thousand, five hundred forty".