78146556 has 12 divisors (see below), whose sum is σ = 182341992. Its totient is φ = 26048848.

The previous prime is 78146531. The next prime is 78146557. The reversal of 78146556 is 65564187.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78146556² = 12213768429322272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78146557) 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, 3256095 + ... + 3256118.

It is an arithmetic number, because the mean of its divisors is an integer number (15195166).

Almost surely, 2^78146556 is an apocalyptic number.

It is an amenable number.

78146556 is an abundant number, since it is smaller than the sum of its proper divisors (104195436).

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

78146556 is a wasteful number, since it uses less digits than its factorization.

78146556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6512220 (or 6512218 counting only the distinct ones).

The product of its digits is 201600, while the sum is 42.

The square root of 78146556 is about 8840.0540722328. The cubic root of 78146556 is about 427.5333006445.

The spelling of 78146556 in words is "seventy-eight million, one hundred forty-six thousand, five hundred fifty-six".