64779245 has 8 divisors (see below), whose sum is σ = 78448920. Its totient is φ = 51347520.

The previous prime is 64779241. The next prime is 64779263. The reversal of 64779245 is 54297746.

It can be written as a sum of positive squares in 4 ways, for example, as 3031081 + 61748164 = 1741^2 + 7858^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64779245 - 2² = 64779241 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 64779196 and 64779205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64779241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58886 + ... + 59975.

It is an arithmetic number, because the mean of its divisors is an integer number (9806115).

Almost surely, 2^64779245 is an apocalyptic number.

It is an amenable number.

64779245 is a deficient number, since it is larger than the sum of its proper divisors (13669675).

64779245 is a wasteful number, since it uses less digits than its factorization.

64779245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118975.

The product of its digits is 423360, while the sum is 44.

The square root of 64779245 is about 8048.5554604538. Note that the first 3 decimals coincide. The cubic root of 64779245 is about 401.6168825044.

The spelling of 64779245 in words is "sixty-four million, seven hundred seventy-nine thousand, two hundred forty-five".