69449840 has 20 divisors (see below), whose sum is σ = 161471064. Its totient is φ = 27779904.

The previous prime is 69449839. The next prime is 69449843. The reversal of 69449840 is 4894496.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 69449791 and 69449800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69449843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 433982 + ... + 434141.

Almost surely, 2^69449840 is an apocalyptic number.

It is an amenable number.

69449840 is an abundant number, since it is smaller than the sum of its proper divisors (92021224).

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

69449840 is a wasteful number, since it uses less digits than its factorization.

69449840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868136 (or 868130 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 69449840 is about 8333.6570603787. The cubic root of 69449840 is about 411.0459907135.

The spelling of 69449840 in words is "sixty-nine million, four hundred forty-nine thousand, eight hundred forty".