64778995 has 16 divisors (see below), whose sum is σ = 80720640. Its totient is φ = 49852800.

The previous prime is 64778981. The next prime is 64779067. The reversal of 64778995 is 59987746.

It is not a de Polignac number, because 64778995 - 2⁵ = 64778963 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26901 + ... + 29209.

It is an arithmetic number, because the mean of its divisors is an integer number (5045040).

Almost surely, 2^64778995 is an apocalyptic number.

64778995 is a deficient number, since it is larger than the sum of its proper divisors (15941645).

64778995 is a wasteful number, since it uses less digits than its factorization.

64778995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2526.

The product of its digits is 3810240, while the sum is 55.

The square root of 64778995 is about 8048.5399297015. The cubic root of 64778995 is about 401.6163658557.

It can be divided in two parts, 6477 and 8995, that multiplied together give a triangular number (58260615 = T₁₀₇₉₄).

The spelling of 64778995 in words is "sixty-four million, seven hundred seventy-eight thousand, nine hundred ninety-five".