69957987 has 8 divisors (see below), whose sum is σ = 101757120. Its totient is φ = 42398760.

The previous prime is 69957977. The next prime is 69958003. The reversal of 69957987 is 78975996.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 69957987 - 2¹¹ = 69955939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 69957987.

It is not an unprimeable number, because it can be changed into a prime (69957977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1059937 + ... + 1060002.

It is an arithmetic number, because the mean of its divisors is an integer number (12719640).

Almost surely, 2^69957987 is an apocalyptic number.

69957987 is a deficient number, since it is larger than the sum of its proper divisors (31799133).

69957987 is a wasteful number, since it uses less digits than its factorization.

69957987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2119953.

The product of its digits is 8573040, while the sum is 60.

The square root of 69957987 is about 8364.0891315193. The cubic root of 69957987 is about 412.0460622613.

Subtracting 69957987 from its reverse (78975996), we obtain a square (9018009 = 3003²).

The spelling of 69957987 in words is "sixty-nine million, nine hundred fifty-seven thousand, nine hundred eighty-seven".