78523380 has 144 divisors (see below), whose sum is σ = 267845760. Its totient is φ = 18475776.

The previous prime is 78523351. The next prime is 78523433. The reversal of 78523380 is 8332587.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53091 + ... + 54549.

It is an arithmetic number, because the mean of its divisors is an integer number (1860040).

Almost surely, 2^78523380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78523380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (133922880).

78523380 is an abundant number, since it is smaller than the sum of its proper divisors (189322380).

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

78523380 is a wasteful number, since it uses less digits than its factorization.

78523380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1505 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 78523380 is about 8861.3418848389. The cubic root of 78523380 is about 428.2193899540.

The spelling of 78523380 in words is "seventy-eight million, five hundred twenty-three thousand, three hundred eighty".