64272821 has 8 divisors (see below), whose sum is σ = 65520000. Its totient is φ = 63035280.

The previous prime is 64272809. The next prime is 64272851. The reversal of 64272821 is 12827246.

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-64272821 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 (64272851) 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, 11855 + ... + 16403.

It is an arithmetic number, because the mean of its divisors is an integer number (8190000).

Almost surely, 2^64272821 is an apocalyptic number.

It is an amenable number.

64272821 is a deficient number, since it is larger than the sum of its proper divisors (1247179).

64272821 is a wasteful number, since it uses less digits than its factorization.

64272821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4819.

The product of its digits is 10752, while the sum is 32.

The square root of 64272821 is about 8017.0331794249. The cubic root of 64272821 is about 400.5675713593.

The spelling of 64272821 in words is "sixty-four million, two hundred seventy-two thousand, eight hundred twenty-one".