64273421 has 4 divisors (see below), whose sum is σ = 64327452. Its totient is φ = 64219392.

The previous prime is 64273399. The next prime is 64273423. The reversal of 64273421 is 12437246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12437246 = 2 ⋅6218623.

It can be written as a sum of positive squares in 2 ways, for example, as 6056521 + 58216900 = 2461^2 + 7630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64273421 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 (64273423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25190 + ... + 27623.

It is an arithmetic number, because the mean of its divisors is an integer number (16081863).

Almost surely, 2^64273421 is an apocalyptic number.

It is an amenable number.

64273421 is a deficient number, since it is larger than the sum of its proper divisors (54031).

64273421 is a wasteful number, since it uses less digits than its factorization.

64273421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54030.

The product of its digits is 8064, while the sum is 29.

The square root of 64273421 is about 8017.0705996642. The cubic root of 64273421 is about 400.5688178156.

The spelling of 64273421 in words is "sixty-four million, two hundred seventy-three thousand, four hundred twenty-one".