39778308025 has 27 divisors (see below), whose sum is σ = 49906848199. Its totient is φ = 31451678720.

The previous prime is 39778307977. The next prime is 39778308029. The reversal of 39778308025 is 52080387793.

The square root of 39778308025 is 199445.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 39357401769 + 420906256 = 198387^2 + 20516^2 .

It is not a de Polignac number, because 39778308025 - 2¹¹ = 39778305977 is a prime.

It is a super-3 number, since 3×39778308025³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39778308029) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 112686249 + ... + 112686601.

Almost surely, 2^39778308025 is an apocalyptic number.

39778308025 is the 199445-th square number.

39778308025 is the 99723-rd centered octagonal number.

It is an amenable number.

39778308025 is a deficient number, since it is larger than the sum of its proper divisors (10128540174).

39778308025 is an frugal number, since it uses more digits than its factorization.

39778308025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 942 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 52.

The spelling of 39778308025 in words is "thirty-nine billion, seven hundred seventy-eight million, three hundred eight thousand, twenty-five".