78147828 has 72 divisors (see below), whose sum is σ = 223510560. Its totient is φ = 23677920.

The previous prime is 78147821. The next prime is 78147833. The reversal of 78147828 is 82874187.

It is a super-2 number, since 2×78147828² = 12214166042235168, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78147821) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7038 + ... + 14346.

Almost surely, 2^78147828 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 78147828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111755280).

78147828 is an abundant number, since it is smaller than the sum of its proper divisors (145362732).

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

78147828 is a wasteful number, since it uses less digits than its factorization.

78147828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7339 (or 7325 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 78147828 is about 8840.1260172013. The cubic root of 78147828 is about 427.5356203006.

The spelling of 78147828 in words is "seventy-eight million, one hundred forty-seven thousand, eight hundred twenty-eight".