64973889 has 12 divisors (see below), whose sum is σ = 96140772. Its totient is φ = 42259200.

The previous prime is 64973879. The next prime is 64973897. The reversal of 64973889 is 98837946.

It can be written as a sum of positive squares in 2 ways, for example, as 31136400 + 33837489 = 5580^2 + 5817^2 .

It is not a de Polignac number, because 64973889 - 2⁷ = 64973761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64973819) 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, 87672 + ... + 88409.

It is an arithmetic number, because the mean of its divisors is an integer number (8011731).

Almost surely, 2^64973889 is an apocalyptic number.

It is an amenable number.

64973889 is a deficient number, since it is larger than the sum of its proper divisors (31166883).

64973889 is a wasteful number, since it uses less digits than its factorization.

64973889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176128 (or 176125 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 64973889 is about 8060.6382501636. The cubic root of 64973889 is about 402.0187300993.

The spelling of 64973889 in words is "sixty-four million, nine hundred seventy-three thousand, eight hundred eighty-nine".