87428972169 has 144 divisors (see below), whose sum is σ = 169298147200. Its totient is φ = 42432698880.

The previous prime is 87428972149. The next prime is 87428972221. The reversal of 87428972169 is 96127982478.

87428972169 is a `hidden beast` number, since 87 + 428 + 9 + 72 + 1 + 69 = 666.

It is not a de Polignac number, because 87428972169 - 2¹² = 87428968073 is a prime.

It is a super-2 number, since 2×87428972169² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (87428972149) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 10568967 + ... + 10577235.

Almost surely, 2^87428972169 is an apocalyptic number.

It is an amenable number.

87428972169 is a deficient number, since it is larger than the sum of its proper divisors (81869175031).

87428972169 is a wasteful number, since it uses less digits than its factorization.

87428972169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8396 (or 8382 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 63.

The spelling of 87428972169 in words is "eighty-seven billion, four hundred twenty-eight million, nine hundred seventy-two thousand, one hundred sixty-nine".