78386028 has 48 divisors (see below), whose sum is σ = 209900544. Its totient is φ = 22302720.

The previous prime is 78385981. The next prime is 78386071. The reversal of 78386028 is 82068387.

It is a super-2 number, since 2×78386028² = 12288738771233568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19773 + ... + 23403.

It is an arithmetic number, because the mean of its divisors is an integer number (4372928).

Almost surely, 2^78386028 is an apocalyptic number.

It is an amenable number.

78386028 is an abundant number, since it is smaller than the sum of its proper divisors (131514516).

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

78386028 is a wasteful number, since it uses less digits than its factorization.

78386028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3902 (or 3900 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 78386028 is about 8853.5884250399. The cubic root of 78386028 is about 427.9695657749.

The spelling of 78386028 in words is "seventy-eight million, three hundred eighty-six thousand, twenty-eight".