69728428 has 48 divisors (see below), whose sum is σ = 153474048. Its totient is φ = 27152400.

The previous prime is 69728411. The next prime is 69728431. The reversal of 69728428 is 82482796.

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, 36333 + ... + 38203.

It is an arithmetic number, because the mean of its divisors is an integer number (3197376).

Almost surely, 2^69728428 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 69728428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76737024).

69728428 is an abundant number, since it is smaller than the sum of its proper divisors (83745620).

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

69728428 is a wasteful number, since it uses less digits than its factorization.

69728428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915 (or 1891 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 69728428 is about 8350.3549625151. The cubic root of 69728428 is about 411.5948746467.

It can be divided in two parts, 6972 and 8428, that added together give a triangular number (15400 = T₁₇₅).

The spelling of 69728428 in words is "sixty-nine million, seven hundred twenty-eight thousand, four hundred twenty-eight".