66158240 has 48 divisors (see below), whose sum is σ = 156854880. Its totient is φ = 26369280.

The previous prime is 66158231. The next prime is 66158263. The reversal of 66158240 is 4285166.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 66158197 and 66158206.

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, 60095 + ... + 61185.

It is an arithmetic number, because the mean of its divisors is an integer number (3267810).

Almost surely, 2^66158240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66158240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78427440).

66158240 is an abundant number, since it is smaller than the sum of its proper divisors (90696640).

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

66158240 is a wasteful number, since it uses less digits than its factorization.

66158240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485 (or 1477 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 66158240 is about 8133.7715728929. The cubic root of 66158240 is about 404.4467169252.

The spelling of 66158240 in words is "sixty-six million, one hundred fifty-eight thousand, two hundred forty".