261420678 has 12 divisors (see below), whose sum is σ = 566411508. Its totient is φ = 87140220.

The previous prime is 261420661. The next prime is 261420683. The reversal of 261420678 is 876024162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7261668 + ... + 7261703.

It is an arithmetic number, because the mean of its divisors is an integer number (47200959).

Almost surely, 2^261420678 is an apocalyptic number.

261420678 is an abundant number, since it is smaller than the sum of its proper divisors (304990830).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261420678 is a wasteful number, since it uses less digits than its factorization.

261420678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14523379 (or 14523376 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 261420678 is about 16168.5088366244. The cubic root of 261420678 is about 639.4108168146.

The spelling of 261420678 in words is "two hundred sixty-one million, four hundred twenty thousand, six hundred seventy-eight".