158978646 has 64 divisors (see below), whose sum is σ = 361520640. Its totient is φ = 51775200.

The previous prime is 158978639. The next prime is 158978657. The reversal of 158978646 is 646879851.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 158978592 and 158978601.

It is a congruent number.

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, 561621 + ... + 561903.

It is an arithmetic number, because the mean of its divisors is an integer number (5648760).

Almost surely, 2^158978646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 158978646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180760320).

158978646 is an abundant number, since it is smaller than the sum of its proper divisors (202541994).

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

158978646 is a wasteful number, since it uses less digits than its factorization.

158978646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498 (or 492 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 158978646 is about 12608.6734433088. The cubic root of 158978646 is about 541.7258977227.

The spelling of 158978646 in words is "one hundred fifty-eight million, nine hundred seventy-eight thousand, six hundred forty-six".