63890920078 has 4 divisors (see below), whose sum is σ = 95836380120. Its totient is φ = 31945460038.

The previous prime is 63890920013. The next prime is 63890920081. The reversal of 63890920078 is 87002909836.

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

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, 15972730018 + ... + 15972730021.

It is an arithmetic number, because the mean of its divisors is an integer number (23959095030).

Almost surely, 2^63890920078 is an apocalyptic number.

63890920078 is a deficient number, since it is larger than the sum of its proper divisors (31945460042).

63890920078 is a wasteful number, since it uses less digits than its factorization.

63890920078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31945460041.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 63890920078 in words is "sixty-three billion, eight hundred ninety million, nine hundred twenty thousand, seventy-eight".