69442987 has 2 divisors, whose sum is σ = 69442988. Its totient is φ = 69442986.

The previous prime is 69442981. The next prime is 69442999. The reversal of 69442987 is 78924496.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 69442987 - 2⁷ = 69442859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 69442987.

It is not a weakly prime, because it can be changed into another prime (69442981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34721493 + 34721494.

It is an arithmetic number, because the mean of its divisors is an integer number (34721494).

Almost surely, 2^69442987 is an apocalyptic number.

69442987 is a deficient number, since it is larger than the sum of its proper divisors (1).

69442987 is an equidigital number, since it uses as much as digits as its factorization.

69442987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The square root of 69442987 is about 8333.2458862078. The cubic root of 69442987 is about 411.0324702080.

It can be divided in two parts, 694 and 42987, that added together give a square (43681 = 209²).

The spelling of 69442987 in words is "sixty-nine million, four hundred forty-two thousand, nine hundred eighty-seven".