64219877 has 2 divisors, whose sum is σ = 64219878. Its totient is φ = 64219876.

The previous prime is 64219861. The next prime is 64219919. The reversal of 64219877 is 77891246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61559716 + 2660161 = 7846^2 + 1631^2 .

It is a cyclic number.

It is not a de Polignac number, because 64219877 - 2⁴ = 64219861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64219277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32109938 + 32109939.

It is an arithmetic number, because the mean of its divisors is an integer number (32109939).

Almost surely, 2^64219877 is an apocalyptic number.

It is an amenable number.

64219877 is a deficient number, since it is larger than the sum of its proper divisors (1).

64219877 is an equidigital number, since it uses as much as digits as its factorization.

64219877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 44.

The square root of 64219877 is about 8013.7305295349. The cubic root of 64219877 is about 400.4575534958.

The spelling of 64219877 in words is "sixty-four million, two hundred nineteen thousand, eight hundred seventy-seven".