64796778 has 12 divisors (see below), whose sum is σ = 140393058. Its totient is φ = 21598920.

The previous prime is 64796761. The next prime is 64796791. The reversal of 64796778 is 87769746.

It can be written as a sum of positive squares in only one way, i.e., 64689849 + 106929 = 8043^2 + 327^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1799893 + ... + 1799928.

Almost surely, 2^64796778 is an apocalyptic number.

64796778 is an abundant number, since it is smaller than the sum of its proper divisors (75596280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64796778 is a wasteful number, since it uses less digits than its factorization.

64796778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3599829 (or 3599826 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 54.

The square root of 64796778 is about 8049.6445884275. The cubic root of 64796778 is about 401.6531128002.

The spelling of 64796778 in words is "sixty-four million, seven hundred ninety-six thousand, seven hundred seventy-eight".