261736490 has 8 divisors (see below), whose sum is σ = 471125700. Its totient is φ = 104694592.

The previous prime is 261736477. The next prime is 261736499. The reversal of 261736490 is 94637162.

261736490 is digitally balanced in base 2, 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 2 ways, for example, as 255136729 + 6599761 = 15973^2 + 2569^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (261736499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13086815 + ... + 13086834.

Almost surely, 2^261736490 is an apocalyptic number.

261736490 is a deficient number, since it is larger than the sum of its proper divisors (209389210).

261736490 is a wasteful number, since it uses less digits than its factorization.

261736490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26173656.

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 261736490 is about 16178.2721574339. The cubic root of 261736490 is about 639.6681955205.

The spelling of 261736490 in words is "two hundred sixty-one million, seven hundred thirty-six thousand, four hundred ninety".