69999440 has 80 divisors (see below), whose sum is σ = 189868800. Its totient is φ = 23990400.

The previous prime is 69999409. The next prime is 69999443. The reversal of 69999440 is 4499996.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69999443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26165 + ... + 28715.

It is an arithmetic number, because the mean of its divisors is an integer number (2373360).

Almost surely, 2^69999440 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 69999440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94934400).

69999440 is an abundant number, since it is smaller than the sum of its proper divisors (119869360).

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

69999440 is a wasteful number, since it uses less digits than its factorization.

69999440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2585 (or 2565 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 50.

The square root of 69999440 is about 8366.5667988728. The cubic root of 69999440 is about 412.1274309685.

The spelling of 69999440 in words is "sixty-nine million, nine hundred ninety-nine thousand, four hundred forty".