261012828 has 12 divisors (see below), whose sum is σ = 609029960. Its totient is φ = 87004272.

The previous prime is 261012821. The next prime is 261012841. The reversal of 261012828 is 828210162.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 261012795 and 261012804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261012821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10875523 + ... + 10875546.

Almost surely, 2^261012828 is an apocalyptic number.

It is an amenable number.

261012828 is an abundant number, since it is smaller than the sum of its proper divisors (348017132).

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

261012828 is a wasteful number, since it uses less digits than its factorization.

261012828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21751076 (or 21751074 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 261012828 is about 16155.8914331584. The cubic root of 261012828 is about 639.0781226044.

The spelling of 261012828 in words is "two hundred sixty-one million, twelve thousand, eight hundred twenty-eight".