66870138 has 8 divisors (see below), whose sum is σ = 133740288. Its totient is φ = 22290044.

The previous prime is 66870127. The next prime is 66870149. The reversal of 66870138 is 83107866.

It is an interprime number because it is at equal distance from previous prime (66870127) and next prime (66870149).

It is a sphenic number, since it is the product of 3 distinct primes.

66870138 is an admirable number.

It is a super-2 number, since 2×66870138² = 8943230712278088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66870096 and 66870105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5572506 + ... + 5572517.

It is an arithmetic number, because the mean of its divisors is an integer number (16717536).

Almost surely, 2^66870138 is an apocalyptic number.

66870138 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66870138 is a wasteful number, since it uses less digits than its factorization.

66870138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11145028.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 66870138 is about 8177.4163401407. The cubic root of 66870138 is about 405.8922319871.

The spelling of 66870138 in words is "sixty-six million, eight hundred seventy thousand, one hundred thirty-eight".