64816078 has 4 divisors (see below), whose sum is σ = 97224120. Its totient is φ = 32408038.

The previous prime is 64816069. The next prime is 64816153. The reversal of 64816078 is 87061846.

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

It is a super-2 number, since 2×64816078² = 8402247934604168, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64816078.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16204018 + ... + 16204021.

It is an arithmetic number, because the mean of its divisors is an integer number (24306030).

Almost surely, 2^64816078 is an apocalyptic number.

64816078 is a deficient number, since it is larger than the sum of its proper divisors (32408042).

64816078 is a wasteful number, since it uses less digits than its factorization.

64816078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32408041.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 64816078 is about 8050.8433098651. The cubic root of 64816078 is about 401.6929868793.

The spelling of 64816078 in words is "sixty-four million, eight hundred sixteen thousand, seventy-eight".