261449028 has 18 divisors (see below), whose sum is σ = 660885134. Its totient is φ = 87149664.

The previous prime is 261449017. The next prime is 261449029. The reversal of 261449028 is 820944162.

261449028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 133125444 + 128323584 = 11538^2 + 11328^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 7262473 = 261449028 / (2 + 6 + 1 + 4 + 4 + 9 + 0 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 261448983 and 261449001.

It is not an unprimeable number, because it can be changed into a prime (261449029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3631201 + ... + 3631272.

Almost surely, 2^261449028 is an apocalyptic number.

It is an amenable number.

261449028 is an abundant number, since it is smaller than the sum of its proper divisors (399436106).

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

261449028 is a wasteful number, since it uses less digits than its factorization.

261449028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7262483 (or 7262478 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 261449028 is about 16169.3855170813. The cubic root of 261449028 is about 639.4339298057.

The spelling of 261449028 in words is "two hundred sixty-one million, four hundred forty-nine thousand, twenty-eight".