78533028 has 72 divisors (see below), whose sum is σ = 228271680. Its totient is φ = 22299840.

The previous prime is 78533011. The next prime is 78533041. The reversal of 78533028 is 82033587.

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

It is a junction number, because it is equal to n+sod(n) for n = 78532983 and 78533001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44238 + ... + 45978.

It is an arithmetic number, because the mean of its divisors is an integer number (3170440).

Almost surely, 2^78533028 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 78533028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114135840).

78533028 is an abundant number, since it is smaller than the sum of its proper divisors (149738652).

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

78533028 is a wasteful number, since it uses less digits than its factorization.

78533028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937 (or 1932 counting only the distinct ones).

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

The square root of 78533028 is about 8861.8862551942. The cubic root of 78533028 is about 428.2369273698.

The spelling of 78533028 in words is "seventy-eight million, five hundred thirty-three thousand, twenty-eight".