78528428 has 12 divisors (see below), whose sum is σ = 149917992. Its totient is φ = 35694720.

The previous prime is 78528403. The next prime is 78528473. The reversal of 78528428 is 82482587.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 1784737 = 78528428 / (7 + 8 + 5 + 2 + 8 + 4 + 2 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 892325 + ... + 892412.

It is an arithmetic number, because the mean of its divisors is an integer number (12493166).

Almost surely, 2^78528428 is an apocalyptic number.

It is an amenable number.

78528428 is a deficient number, since it is larger than the sum of its proper divisors (71389564).

78528428 is a wasteful number, since it uses less digits than its factorization.

78528428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1784752 (or 1784750 counting only the distinct ones).

The product of its digits is 286720, while the sum is 44.

The square root of 78528428 is about 8861.6267129687. The cubic root of 78528428 is about 428.2285660116.

The spelling of 78528428 in words is "seventy-eight million, five hundred twenty-eight thousand, four hundred twenty-eight".