69997928 has 64 divisors (see below), whose sum is σ = 176238720. Its totient is φ = 25171200.

The previous prime is 69997903. The next prime is 69997931. The reversal of 69997928 is 82979996.

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, 3638 + ... + 12378.

It is an arithmetic number, because the mean of its divisors is an integer number (2753730).

Almost surely, 2^69997928 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 69997928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88119360).

69997928 is an abundant number, since it is smaller than the sum of its proper divisors (106240792).

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

69997928 is a wasteful number, since it uses less digits than its factorization.

69997928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8778 (or 8774 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 59.

The square root of 69997928 is about 8366.4764387405. The cubic root of 69997928 is about 412.1244636059.

It can be divided in two parts, 699979 and 28, that added together give a palindrome (700007).

The spelling of 69997928 in words is "sixty-nine million, nine hundred ninety-seven thousand, nine hundred twenty-eight".