261015328 has 48 divisors (see below), whose sum is σ = 588518784. Its totient is φ = 111628800.

The previous prime is 261015281. The next prime is 261015361. The reversal of 261015328 is 823510162.

261015328 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 (28).

It is a junction number, because it is equal to n+sod(n) for n = 261015296 and 261015305.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144028 + ... + 145828.

It is an arithmetic number, because the mean of its divisors is an integer number (12260808).

Almost surely, 2^261015328 is an apocalyptic number.

261015328 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

261015328 is an abundant number, since it is smaller than the sum of its proper divisors (327503456).

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

261015328 is a wasteful number, since it uses less digits than its factorization.

261015328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2465 (or 2457 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 261015328 is about 16155.9688041293. The cubic root of 261015328 is about 639.0801629769.

The spelling of 261015328 in words is "two hundred sixty-one million, fifteen thousand, three hundred twenty-eight".