78225558 has 16 divisors (see below), whose sum is σ = 156903600. Its totient is φ = 25999776.

The previous prime is 78225547. The next prime is 78225569. The reversal of 78225558 is 85552287.

It is an interprime number because it is at equal distance from previous prime (78225547) and next prime (78225569).

It is a super-3 number, since 3×78225558³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16585 + ... + 20772.

It is an arithmetic number, because the mean of its divisors is an integer number (9806475).

Almost surely, 2^78225558 is an apocalyptic number.

78225558 is an abundant number, since it is smaller than the sum of its proper divisors (78678042).

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

78225558 is a wasteful number, since it uses less digits than its factorization.

78225558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37711.

The product of its digits is 224000, while the sum is 42.

The square root of 78225558 is about 8844.5213550536. The cubic root of 78225558 is about 427.6773232436.

The spelling of 78225558 in words is "seventy-eight million, two hundred twenty-five thousand, five hundred fifty-eight".