261697970 has 16 divisors (see below), whose sum is σ = 486252288. Its totient is φ = 101302320.

The previous prime is 261697897. The next prime is 261697973. The reversal of 261697970 is 79796162.

It is not an unprimeable number, because it can be changed into a prime (261697973) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 421784 + ... + 422403.

It is an arithmetic number, because the mean of its divisors is an integer number (30390768).

Almost surely, 2^261697970 is an apocalyptic number.

261697970 is a deficient number, since it is larger than the sum of its proper divisors (224554318).

261697970 is a wasteful number, since it uses less digits than its factorization.

261697970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844225.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 261697970 is about 16177.0816280317. The cubic root of 261697970 is about 639.6368137954.

The spelling of 261697970 in words is "two hundred sixty-one million, six hundred ninety-seven thousand, nine hundred seventy".