78558620 has 48 divisors (see below), whose sum is σ = 192568320. Its totient is φ = 26359104.

The previous prime is 78558607. The next prime is 78558629. The reversal of 78558620 is 2685587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78558629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 611 + ... + 12549.

It is an arithmetic number, because the mean of its divisors is an integer number (4011840).

Almost surely, 2^78558620 is an apocalyptic number.

78558620 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78558620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96284160).

78558620 is an abundant number, since it is smaller than the sum of its proper divisors (114009700).

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

78558620 is a wasteful number, since it uses less digits than its factorization.

78558620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12002 (or 12000 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 78558620 is about 8863.3300739620. The cubic root of 78558620 is about 428.2834396439.

The spelling of 78558620 in words is "seventy-eight million, five hundred fifty-eight thousand, six hundred twenty".