261462644 has 6 divisors (see below), whose sum is σ = 457559634. Its totient is φ = 130731320.

The previous prime is 261462623. The next prime is 261462671. The reversal of 261462644 is 446264162.

It can be written as a sum of positive squares in only one way, i.e., 251603044 + 9859600 = 15862^2 + 3140^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32682827 + ... + 32682834.

It is an arithmetic number, because the mean of its divisors is an integer number (76259939).

Almost surely, 2^261462644 is an apocalyptic number.

It is an amenable number.

261462644 is a deficient number, since it is larger than the sum of its proper divisors (196096990).

261462644 is a wasteful number, since it uses less digits than its factorization.

261462644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65365665 (or 65365663 counting only the distinct ones).

The product of its digits is 55296, while the sum is 35.

The square root of 261462644 is about 16169.8065541923. The cubic root of 261462644 is about 639.4450299697.

The spelling of 261462644 in words is "two hundred sixty-one million, four hundred sixty-two thousand, six hundred forty-four".