261790738 has 16 divisors (see below), whose sum is σ = 447011136. Its totient is φ = 113821840.

The previous prime is 261790723. The next prime is 261790747. The reversal of 261790738 is 837097162.

It is a happy number.

261790738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261790694 and 261790703.

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, 258181 + ... + 259192.

It is an arithmetic number, because the mean of its divisors is an integer number (27938196).

Almost surely, 2^261790738 is an apocalyptic number.

261790738 is a deficient number, since it is larger than the sum of its proper divisors (185220398).

261790738 is a wasteful number, since it uses less digits than its factorization.

261790738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517409.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 261790738 is about 16179.9486402151. The cubic root of 261790738 is about 639.7123854144.

The spelling of 261790738 in words is "two hundred sixty-one million, seven hundred ninety thousand, seven hundred thirty-eight".