158640640 has 80 divisors (see below), whose sum is σ = 392832000. Its totient is φ = 61378560.

The previous prime is 158640623. The next prime is 158640673. The reversal of 158640640 is 46046851.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 158640596 and 158640605.

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, 78361 + ... + 80359.

It is an arithmetic number, because the mean of its divisors is an integer number (4910400).

Almost surely, 2^158640640 is an apocalyptic number.

158640640 is a gapful number since it is divisible by the number (10) 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 158640640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196416000).

158640640 is an abundant number, since it is smaller than the sum of its proper divisors (234191360).

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

158640640 is an equidigital number, since it uses as much as digits as its factorization.

158640640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2053 (or 2037 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 158640640 is about 12595.2626014704. The cubic root of 158640640 is about 541.3417024652.

The spelling of 158640640 in words is "one hundred fifty-eight million, six hundred forty thousand, six hundred forty".