64978129 has 2 divisors, whose sum is σ = 64978130. Its totient is φ = 64978128.

The previous prime is 64978079. The next prime is 64978189. The reversal of 64978129 is 92187946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63632529 + 1345600 = 7977^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 64978129 - 2¹⁹ = 64453841 is a prime.

It is not a weakly prime, because it can be changed into another prime (64978189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32489064 + 32489065.

It is an arithmetic number, because the mean of its divisors is an integer number (32489065).

Almost surely, 2^64978129 is an apocalyptic number.

It is an amenable number.

64978129 is a deficient number, since it is larger than the sum of its proper divisors (1).

64978129 is an equidigital number, since it uses as much as digits as its factorization.

64978129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 64978129 is about 8060.9012523415. The cubic root of 64978129 is about 402.0274747523.

The spelling of 64978129 in words is "sixty-four million, nine hundred seventy-eight thousand, one hundred twenty-nine".