261758290 has 16 divisors (see below), whose sum is σ = 477620568. Its totient is φ = 103268736.

The previous prime is 261758261. The next prime is 261758291. The reversal of 261758290 is 92857162.

261758290 is digitally balanced in base 3, 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 4 ways, for example, as 156675289 + 105083001 = 12517^2 + 10251^2 .

It is not an unprimeable number, because it can be changed into a prime (261758291) 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, 178557 + ... + 180016.

Almost surely, 2^261758290 is an apocalyptic number.

261758290 is a deficient number, since it is larger than the sum of its proper divisors (215862278).

261758290 is a wasteful number, since it uses less digits than its factorization.

261758290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358653.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 261758290 is about 16178.9458865527. The cubic root of 261758290 is about 639.6859543226.

The spelling of 261758290 in words is "two hundred sixty-one million, seven hundred fifty-eight thousand, two hundred ninety".