66157280 has 48 divisors (see below), whose sum is σ = 178627680. Its totient is φ = 22682112.

The previous prime is 66157277. The next prime is 66157307. The reversal of 66157280 is 8275166.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 66157280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28415 + ... + 30654.

It is an arithmetic number, because the mean of its divisors is an integer number (3721410).

Almost surely, 2^66157280 is an apocalyptic number.

It is an amenable number.

66157280 is an abundant number, since it is smaller than the sum of its proper divisors (112470400).

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

66157280 is a wasteful number, since it uses less digits than its factorization.

66157280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59091 (or 59083 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 66157280 is about 8133.7125594651. The cubic root of 66157280 is about 404.4447606522. Note that the first 3 decimals are identical.

The spelling of 66157280 in words is "sixty-six million, one hundred fifty-seven thousand, two hundred eighty".