64420771 has 4 divisors (see below), whose sum is σ = 64449352. Its totient is φ = 64392192.

The previous prime is 64420757. The next prime is 64420789. The reversal of 64420771 is 17702446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17702446 = 2 ⋅8851223.

It is a cyclic number.

It is not a de Polignac number, because 64420771 - 2⁵ = 64420739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61420771) 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, 10590 + ... + 15523.

It is an arithmetic number, because the mean of its divisors is an integer number (16112338).

Almost surely, 2^64420771 is an apocalyptic number.

64420771 is a deficient number, since it is larger than the sum of its proper divisors (28581).

64420771 is a wasteful number, since it uses less digits than its factorization.

64420771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28580.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 64420771 is about 8026.2551043435. The cubic root of 64420771 is about 400.8746921400.

The spelling of 64420771 in words is "sixty-four million, four hundred twenty thousand, seven hundred seventy-one".