64778354 has 4 divisors (see below), whose sum is σ = 97167534. Its totient is φ = 32389176.

The previous prime is 64778333. The next prime is 64778359. The reversal of 64778354 is 45387746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 10387729 = 7375^2 + 3223^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64778359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16194587 + ... + 16194590.

Almost surely, 2^64778354 is an apocalyptic number.

64778354 is a deficient number, since it is larger than the sum of its proper divisors (32389180).

64778354 is a wasteful number, since it uses less digits than its factorization.

64778354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32389179.

The product of its digits is 564480, while the sum is 44.

The square root of 64778354 is about 8048.5001087159. The cubic root of 64778354 is about 401.6150411622.

The spelling of 64778354 in words is "sixty-four million, seven hundred seventy-eight thousand, three hundred fifty-four".