147978640 has 20 divisors (see below), whose sum is σ = 344050524. Its totient is φ = 59191424.

The previous prime is 147978637. The next prime is 147978643. The reversal of 147978640 is 46879741.

It is an interprime number because it is at equal distance from previous prime (147978637) and next prime (147978643).

It can be written as a sum of positive squares in 2 ways, for example, as 88811776 + 59166864 = 9424^2 + 7692^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (147978643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 924787 + ... + 924946.

Almost surely, 2^147978640 is an apocalyptic number.

147978640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

147978640 is an abundant number, since it is smaller than the sum of its proper divisors (196071884).

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

147978640 is a wasteful number, since it uses less digits than its factorization.

147978640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849746 (or 1849740 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 147978640 is about 12164.6471383267. The cubic root of 147978640 is about 528.9317989127.

The spelling of 147978640 in words is "one hundred forty-seven million, nine hundred seventy-eight thousand, six hundred forty".