65437749 has 12 divisors (see below), whose sum is σ = 101792236. Its totient is φ = 40269312.

The previous prime is 65437727. The next prime is 65437751. The reversal of 65437749 is 94773456.

It can be written as a sum of positive squares in 2 ways, for example, as 7784100 + 57653649 = 2790^2 + 7593^2 .

It is not a de Polignac number, because 65437749 - 2¹³ = 65429557 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65437759) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 279532 + ... + 279765.

Almost surely, 2^65437749 is an apocalyptic number.

It is an amenable number.

65437749 is a deficient number, since it is larger than the sum of its proper divisors (36354487).

65437749 is a wasteful number, since it uses less digits than its factorization.

65437749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559316 (or 559313 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 65437749 is about 8089.3602342831. The cubic root of 65437749 is about 402.9731565140.

The spelling of 65437749 in words is "sixty-five million, four hundred thirty-seven thousand, seven hundred forty-nine".