69387840 has 140 divisors (see below), whose sum is σ = 246916956. Its totient is φ = 18496512.

The previous prime is 69387823. The next prime is 69387841. The reversal of 69387840 is 4878396.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10036224 + 59351616 = 3168^2 + 7704^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (69387841) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24582 + ... + 27258.

Almost surely, 2^69387840 is an apocalyptic number.

69387840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 69387840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123458478).

69387840 is an abundant number, since it is smaller than the sum of its proper divisors (177529116).

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

69387840 is a wasteful number, since it uses less digits than its factorization.

69387840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706 (or 2687 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 69387840 is about 8329.9363743068. The cubic root of 69387840 is about 410.9236365132.

The spelling of 69387840 in words is "sixty-nine million, three hundred eighty-seven thousand, eight hundred forty".