2978975825 has 54 divisors (see below), whose sum is σ = 4361737014. Its totient is φ = 2012398080.

The previous prime is 2978975821. The next prime is 2978975833. The reversal of 2978975825 is 5285798792.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 121859521 + 2857116304 = 11039^2 + 53452^2 .

It is not a de Polignac number, because 2978975825 - 2² = 2978975821 is a prime.

It is a Duffinian number.

Its product of digits (25401600) is a multiple of the sum of its prime divisors (448).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2978975821) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 8438849 + ... + 8439201.

Almost surely, 2^2978975825 is an apocalyptic number.

2978975825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2978975825 is a deficient number, since it is larger than the sum of its proper divisors (1382761189).

2978975825 is an equidigital number, since it uses as much as digits as its factorization.

2978975825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 448 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 62.

The square root of 2978975825 is about 54579.9947325025. The cubic root of 2978975825 is about 1438.8725461445.

The spelling of 2978975825 in words is "two billion, nine hundred seventy-eight million, nine hundred seventy-five thousand, eight hundred twenty-five".