69998721 has 32 divisors (see below), whose sum is σ = 105840000. Its totient is φ = 40846848.

The previous prime is 69998699. The next prime is 69998749. The reversal of 69998721 is 12789996.

It is a happy number.

It is not a de Polignac number, because 69998721 - 2⁵ = 69998689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (69998771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66205 + ... + 67253.

It is an arithmetic number, because the mean of its divisors is an integer number (3307500).

Almost surely, 2^69998721 is an apocalyptic number.

It is an amenable number.

69998721 is a deficient number, since it is larger than the sum of its proper divisors (35841279).

69998721 is a wasteful number, since it uses less digits than its factorization.

69998721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1153.

The product of its digits is 489888, while the sum is 51.

The square root of 69998721 is about 8366.5238301220. The cubic root of 69998721 is about 412.1260199066.

The spelling of 69998721 in words is "sixty-nine million, nine hundred ninety-eight thousand, seven hundred twenty-one".