261772970 has 32 divisors (see below), whose sum is σ = 507384000. Its totient is φ = 96875776.

The previous prime is 261772969. The next prime is 261772991. The reversal of 261772970 is 79277162.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3020 + ... + 23079.

It is an arithmetic number, because the mean of its divisors is an integer number (15855750).

Almost surely, 2^261772970 is an apocalyptic number.

261772970 is a deficient number, since it is larger than the sum of its proper divisors (245611030).

261772970 is a wasteful number, since it uses less digits than its factorization.

261772970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26182.

The product of its (nonzero) digits is 74088, while the sum is 41.

The square root of 261772970 is about 16179.3995562258. The cubic root of 261772970 is about 639.6979124466.

The spelling of 261772970 in words is "two hundred sixty-one million, seven hundred seventy-two thousand, nine hundred seventy".