78530428 has 24 divisors (see below), whose sum is σ = 141571584. Its totient is φ = 38088000.

The previous prime is 78530399. The next prime is 78530437. The reversal of 78530428 is 82403587.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67653 + ... + 68803.

It is an arithmetic number, because the mean of its divisors is an integer number (5898816).

Almost surely, 2^78530428 is an apocalyptic number.

It is an amenable number.

78530428 is a deficient number, since it is larger than the sum of its proper divisors (63041156).

78530428 is a wasteful number, since it uses less digits than its factorization.

78530428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653 (or 1651 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 78530428 is about 8861.7395583486. The cubic root of 78530428 is about 428.2322014248.

It can be divided in two parts, 785 and 30428, that added together give a palindrome (31213).

The spelling of 78530428 in words is "seventy-eight million, five hundred thirty thousand, four hundred twenty-eight".