69987645 has 112 divisors (see below), whose sum is σ = 155713152. Its totient is φ = 29393280.

The previous prime is 69987587. The next prime is 69987649. The reversal of 69987645 is 54678996.

It is not a de Polignac number, because 69987645 - 2⁹ = 69987133 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 69987591 and 69987600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69987649) by changing a digit.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 331590 + ... + 331800.

It is an arithmetic number, because the mean of its divisors is an integer number (1390296).

Almost surely, 2^69987645 is an apocalyptic number.

69987645 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

69987645 is an abundant number, since it is smaller than the sum of its proper divisors (85725507).

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

69987645 is a wasteful number, since it uses less digits than its factorization.

69987645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 239 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The square root of 69987645 is about 8365.8618802847. The cubic root of 69987645 is about 412.1042816590.

The spelling of 69987645 in words is "sixty-nine million, nine hundred eighty-seven thousand, six hundred forty-five".