820550078 has 4 divisors (see below), whose sum is σ = 1230825120. Its totient is φ = 410275038.

The previous prime is 820550077. The next prime is 820550083. The reversal of 820550078 is 870055028.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820550077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205137518 + ... + 205137521.

It is an arithmetic number, because the mean of its divisors is an integer number (307706280).

Almost surely, 2^820550078 is an apocalyptic number.

820550078 is a deficient number, since it is larger than the sum of its proper divisors (410275042).

820550078 is a wasteful number, since it uses less digits than its factorization.

820550078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410275041.

The product of its (nonzero) digits is 22400, while the sum is 35.

The square root of 820550078 is about 28645.2452948129. The cubic root of 820550078 is about 936.1994113021.

The spelling of 820550078 in words is "eight hundred twenty million, five hundred fifty thousand, seventy-eight".