261740734 has 4 divisors (see below), whose sum is σ = 392611104. Its totient is φ = 130870366.

The previous prime is 261740729. The next prime is 261740737. The reversal of 261740734 is 437047162.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 261740734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261740737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65435182 + ... + 65435185.

It is an arithmetic number, because the mean of its divisors is an integer number (98152776).

Almost surely, 2^261740734 is an apocalyptic number.

261740734 is a deficient number, since it is larger than the sum of its proper divisors (130870370).

261740734 is a wasteful number, since it uses less digits than its factorization.

261740734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130870369.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 261740734 is about 16178.4033204763. The cubic root of 261740734 is about 639.6716528619.

Adding to 261740734 its reverse (437047162), we get a palindrome (698787896).

The spelling of 261740734 in words is "two hundred sixty-one million, seven hundred forty thousand, seven hundred thirty-four".