64773121 has 16 divisors (see below), whose sum is σ = 75672576. Its totient is φ = 54297936.

The previous prime is 64773073. The next prime is 64773151. The reversal of 64773121 is 12137746.

It is not a de Polignac number, because 64773121 - 2⁷ = 64772993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64773151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77910 + ... + 78736.

It is an arithmetic number, because the mean of its divisors is an integer number (4729536).

Almost surely, 2^64773121 is an apocalyptic number.

It is an amenable number.

64773121 is a deficient number, since it is larger than the sum of its proper divisors (10899455).

64773121 is a wasteful number, since it uses less digits than its factorization.

64773121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068.

The product of its digits is 7056, while the sum is 31.

The square root of 64773121 is about 8048.1750105226. The cubic root of 64773121 is about 401.6042262939.

The spelling of 64773121 in words is "sixty-four million, seven hundred seventy-three thousand, one hundred twenty-one".