261948590 has 32 divisors (see below), whose sum is σ = 499685760. Its totient is φ = 98694400.

The previous prime is 261948559. The next prime is 261948593. The reversal of 261948590 is 95849162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261948593) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 875 + ... + 22905.

It is an arithmetic number, because the mean of its divisors is an integer number (15615180).

Almost surely, 2^261948590 is an apocalyptic number.

261948590 is a deficient number, since it is larger than the sum of its proper divisors (237737170).

261948590 is a wasteful number, since it uses less digits than its factorization.

261948590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22108.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 261948590 is about 16184.8259181247. The cubic root of 261948590 is about 639.8409354045.

The spelling of 261948590 in words is "two hundred sixty-one million, nine hundred forty-eight thousand, five hundred ninety".