69987749 has 4 divisors (see below), whose sum is σ = 75371436. Its totient is φ = 64604064.

The previous prime is 69987727. The next prime is 69987763. The reversal of 69987749 is 94778996.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6466849 + 63520900 = 2543^2 + 7970^2 .

It is a cyclic number.

It is not a de Polignac number, because 69987749 - 2¹⁶ = 69922213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69987349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2691824 + ... + 2691849.

It is an arithmetic number, because the mean of its divisors is an integer number (18842859).

Almost surely, 2^69987749 is an apocalyptic number.

It is an amenable number.

69987749 is a deficient number, since it is larger than the sum of its proper divisors (5383687).

69987749 is a wasteful number, since it uses less digits than its factorization.

69987749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5383686.

The product of its digits is 6858432, while the sum is 59.

The square root of 69987749 is about 8365.8680960197. The cubic root of 69987749 is about 412.1044857847.

The spelling of 69987749 in words is "sixty-nine million, nine hundred eighty-seven thousand, seven hundred forty-nine".