66378732 has 48 divisors (see below), whose sum is σ = 180633600. Its totient is φ = 18964176.

The previous prime is 66378691. The next prime is 66378743. The reversal of 66378732 is 23787366.

It is a super-2 number, since 2×66378732² = 8812272123855648, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3948 + ... + 12179.

It is an arithmetic number, because the mean of its divisors is an integer number (3763200).

Almost surely, 2^66378732 is an apocalyptic number.

It is an amenable number.

66378732 is an abundant number, since it is smaller than the sum of its proper divisors (114254868).

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

66378732 is a wasteful number, since it uses less digits than its factorization.

66378732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16155 (or 16139 counting only the distinct ones).

The product of its digits is 254016, while the sum is 42.

The square root of 66378732 is about 8147.3144041457. The cubic root of 66378732 is about 404.8955316589.

The spelling of 66378732 in words is "sixty-six million, three hundred seventy-eight thousand, seven hundred thirty-two".