66142740 has 48 divisors (see below), whose sum is σ = 185552640. Its totient is φ = 17604480.

The previous prime is 66142723. The next prime is 66142751. The reversal of 66142740 is 4724166.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 66142698 and 66142707.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61810 + ... + 62870.

It is an arithmetic number, because the mean of its divisors is an integer number (3865680).

Almost surely, 2^66142740 is an apocalyptic number.

66142740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66142740 is an abundant number, since it is smaller than the sum of its proper divisors (119409900).

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

66142740 is a wasteful number, since it uses less digits than its factorization.

66142740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112 (or 2110 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 66142740 is about 8132.8186995654. The cubic root of 66142740 is about 404.4151289539.

The spelling of 66142740 in words is "sixty-six million, one hundred forty-two thousand, seven hundred forty".