261478734 has 64 divisors (see below), whose sum is σ = 607191552. Its totient is φ = 74188800.

The previous prime is 261478687. The next prime is 261478753. The reversal of 261478734 is 437874162.

It is a super-2 number, since 2×261478734² = 136742256668485512, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 269919 + ... + 270885.

It is an arithmetic number, because the mean of its divisors is an integer number (9487368).

Almost surely, 2^261478734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261478734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303595776).

261478734 is an abundant number, since it is smaller than the sum of its proper divisors (345712818).

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

261478734 is a wasteful number, since it uses less digits than its factorization.

261478734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241.

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

The square root of 261478734 is about 16170.3040787735. The cubic root of 261478734 is about 639.4581465146.

The spelling of 261478734 in words is "two hundred sixty-one million, four hundred seventy-eight thousand, seven hundred thirty-four".