64242778 has 8 divisors (see below), whose sum is σ = 96399072. Its totient is φ = 32109756.

The previous prime is 64242751. The next prime is 64242791. The reversal of 64242778 is 87724246.

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

It is a self number, because there is not a number n which added to its sum of digits gives 64242778.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5451 + ... + 12577.

It is an arithmetic number, because the mean of its divisors is an integer number (12049884).

Almost surely, 2^64242778 is an apocalyptic number.

64242778 is a deficient number, since it is larger than the sum of its proper divisors (32156294).

64242778 is a wasteful number, since it uses less digits than its factorization.

64242778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11636.

The product of its digits is 150528, while the sum is 40.

The square root of 64242778 is about 8015.1592622979. The cubic root of 64242778 is about 400.5051492919.

The spelling of 64242778 in words is "sixty-four million, two hundred forty-two thousand, seven hundred seventy-eight".