69988513 has 12 divisors (see below), whose sum is σ = 84224340. Its totient is φ = 57920352.

The previous prime is 69988511. The next prime is 69988519. The reversal of 69988513 is 31588996.

It can be written as a sum of positive squares in 2 ways, for example, as 21086464 + 48902049 = 4592^2 + 6993^2 .

It is not a de Polignac number, because 69988513 - 2¹ = 69988511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (69988511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23206 + ... + 26047.

It is an arithmetic number, because the mean of its divisors is an integer number (7018695).

Almost surely, 2^69988513 is an apocalyptic number.

It is an amenable number.

69988513 is a deficient number, since it is larger than the sum of its proper divisors (14235827).

69988513 is a wasteful number, since it uses less digits than its factorization.

69988513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49296 (or 49289 counting only the distinct ones).

The product of its digits is 466560, while the sum is 49.

The square root of 69988513 is about 8365.9137576238. The cubic root of 69988513 is about 412.1059853170.

The spelling of 69988513 in words is "sixty-nine million, nine hundred eighty-eight thousand, five hundred thirteen".