258621228078 has 32 divisors (see below), whose sum is σ = 535166092800. Its totient is φ = 83220777696.

The previous prime is 258621228031. The next prime is 258621228109. The reversal of 258621228078 is 870822126852.

It is a happy number.

It is a super-2 number, since 2×258621228078² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 258621228078.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 971103 + ... + 1208421.

It is an arithmetic number, because the mean of its divisors is an integer number (16723940400).

Almost surely, 2^258621228078 is an apocalyptic number.

258621228078 is an abundant number, since it is smaller than the sum of its proper divisors (276544864722).

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

258621228078 is a wasteful number, since it uses less digits than its factorization.

258621228078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243616.

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 258621228078 in words is "two hundred fifty-eight billion, six hundred twenty-one million, two hundred twenty-eight thousand, seventy-eight".