78985558 has 8 divisors (see below), whose sum is σ = 119000952. Its totient is φ = 39318576.

The previous prime is 78985547. The next prime is 78985559. The reversal of 78985558 is 85558987.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×78985558³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78985499 and 78985508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78985559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86535 + ... + 87442.

It is an arithmetic number, because the mean of its divisors is an integer number (14875119).

Almost surely, 2^78985558 is an apocalyptic number.

78985558 is a deficient number, since it is larger than the sum of its proper divisors (40015394).

78985558 is a wasteful number, since it uses less digits than its factorization.

78985558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174206.

The product of its digits is 4032000, while the sum is 55.

The square root of 78985558 is about 8887.3819542090. The cubic root of 78985558 is about 429.0578941398.

It can be divided in two parts, 7898 and 5558, that added together give a square (13456 = 116²).

The spelling of 78985558 in words is "seventy-eight million, nine hundred eighty-five thousand, five hundred fifty-eight".