66472140 has 96 divisors (see below), whose sum is σ = 214953984. Its totient is φ = 15033600.

The previous prime is 66472099. The next prime is 66472157. The reversal of 66472140 is 4127466.

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 = 66472098 and 66472107.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41637 + ... + 43203.

It is an arithmetic number, because the mean of its divisors is an integer number (2239104).

Almost surely, 2^66472140 is an apocalyptic number.

66472140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66472140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107476992).

66472140 is an abundant number, since it is smaller than the sum of its proper divisors (148481844).

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

66472140 is a wasteful number, since it uses less digits than its factorization.

66472140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687 (or 1685 counting only the distinct ones).

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

The square root of 66472140 is about 8153.0448300006. The cubic root of 66472140 is about 405.0853653313.

The spelling of 66472140 in words is "sixty-six million, four hundred seventy-two thousand, one hundred forty".