64771421 has 12 divisors (see below), whose sum is σ = 76673436. Its totient is φ = 54352320.

The previous prime is 64771417. The next prime is 64771429. The reversal of 64771421 is 12417746.

It can be written as a sum of positive squares in 2 ways, for example, as 12859396 + 51912025 = 3586^2 + 7205^2 .

It is not a de Polignac number, because 64771421 - 2² = 64771417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64771429) 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, 19016 + ... + 22161.

It is an arithmetic number, because the mean of its divisors is an integer number (6389453).

Almost surely, 2^64771421 is an apocalyptic number.

It is an amenable number.

64771421 is a deficient number, since it is larger than the sum of its proper divisors (11902015).

64771421 is a wasteful number, since it uses less digits than its factorization.

64771421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41212 (or 41201 counting only the distinct ones).

The product of its digits is 9408, while the sum is 32.

The square root of 64771421 is about 8048.0693958241. The cubic root of 64771421 is about 401.6007128346.

The spelling of 64771421 in words is "sixty-four million, seven hundred seventy-one thousand, four hundred twenty-one".