158640420 has 24 divisors (see below), whose sum is σ = 444193344. Its totient is φ = 42304096.

The previous prime is 158640401. The next prime is 158640457. The reversal of 158640420 is 24046851.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 15.

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, 1321944 + ... + 1322063.

It is an arithmetic number, because the mean of its divisors is an integer number (18508056).

Almost surely, 2^158640420 is an apocalyptic number.

158640420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

158640420 is an abundant number, since it is smaller than the sum of its proper divisors (285552924).

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

158640420 is a wasteful number, since it uses less digits than its factorization.

158640420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2644019 (or 2644017 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 158640420 is about 12595.2538680251. The cubic root of 158640420 is about 541.3414522241.

The spelling of 158640420 in words is "one hundred fifty-eight million, six hundred forty thousand, four hundred twenty".