64778742 has 24 divisors (see below), whose sum is σ = 160404816. Its totient is φ = 18508176.

The previous prime is 64778731. The next prime is 64778783. The reversal of 64778742 is 24787746.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 256933 + ... + 257184.

It is an arithmetic number, because the mean of its divisors is an integer number (6683534).

Almost surely, 2^64778742 is an apocalyptic number.

64778742 is an abundant number, since it is smaller than the sum of its proper divisors (95626074).

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

64778742 is a wasteful number, since it uses less digits than its factorization.

64778742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514132 (or 514129 counting only the distinct ones).

The product of its digits is 526848, while the sum is 45.

The square root of 64778742 is about 8048.5242125498. The cubic root of 64778742 is about 401.6158430058.

The spelling of 64778742 in words is "sixty-four million, seven hundred seventy-eight thousand, seven hundred forty-two".