65749421 has 8 divisors (see below), whose sum is σ = 70572024. Its totient is φ = 61032960.

The previous prime is 65749391. The next prime is 65749429. The reversal of 65749421 is 12494756.

It can be written as a sum of positive squares in 4 ways, for example, as 42120100 + 23629321 = 6490^2 + 4861^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65749421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65749429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25250 + ... + 27731.

It is an arithmetic number, because the mean of its divisors is an integer number (8821503).

Almost surely, 2^65749421 is an apocalyptic number.

It is an amenable number.

65749421 is a deficient number, since it is larger than the sum of its proper divisors (4822603).

65749421 is a wasteful number, since it uses less digits than its factorization.

65749421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53071.

The product of its digits is 60480, while the sum is 38.

The square root of 65749421 is about 8108.6016673653. The cubic root of 65749421 is about 403.6119141063.

The spelling of 65749421 in words is "sixty-five million, seven hundred forty-nine thousand, four hundred twenty-one".