66887470 has 16 divisors (see below), whose sum is σ = 129659040. Its totient is φ = 24696864.

The previous prime is 66887461. The next prime is 66887477. The reversal of 66887470 is 7478866.

It is a self number, because there is not a number n which added to its sum of digits gives 66887470.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66887477) 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, 257130 + ... + 257389.

It is an arithmetic number, because the mean of its divisors is an integer number (8103690).

Almost surely, 2^66887470 is an apocalyptic number.

66887470 is a deficient number, since it is larger than the sum of its proper divisors (62771570).

66887470 is a wasteful number, since it uses less digits than its factorization.

66887470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514539.

The product of its (nonzero) digits is 451584, while the sum is 46.

The square root of 66887470 is about 8178.4760194061. The cubic root of 66887470 is about 405.9272965499.

The spelling of 66887470 in words is "sixty-six million, eight hundred eighty-seven thousand, four hundred seventy".