261437478 has 32 divisors (see below), whose sum is σ = 535030272. Its totient is φ = 85142400.

The previous prime is 261437471. The next prime is 261437479. The reversal of 261437478 is 874734162.

261437478 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261437471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45423 + ... + 50853.

It is an arithmetic number, because the mean of its divisors is an integer number (16719696).

Almost surely, 2^261437478 is an apocalyptic number.

261437478 is an abundant number, since it is smaller than the sum of its proper divisors (273592794).

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

261437478 is a wasteful number, since it uses less digits than its factorization.

261437478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5620.

The product of its digits is 225792, while the sum is 42.

The square root of 261437478 is about 16169.0283567072. The cubic root of 261437478 is about 639.4245136037.

The spelling of 261437478 in words is "two hundred sixty-one million, four hundred thirty-seven thousand, four hundred seventy-eight".