78411025 has 81 divisors (see below), whose sum is σ = 129961083. Its totient is φ = 46754400.

The previous prime is 78411023. The next prime is 78411049. The reversal of 78411025 is 52011487.

The square root of 78411025 is 8855.

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

It can be written as a sum of positive squares in only one way, i.e., 28227969 + 50183056 = 5313^2 + 7084^2 .

It is not a de Polignac number, because 78411025 - 2¹ = 78411023 is a prime.

It is a super-2 number, since 2×78411025² = 12296577683101250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78410984 and 78411002.

It is not an unprimeable number, because it can be changed into a prime (78411023) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 3409164 + ... + 3409186.

Almost surely, 2^78411025 is an apocalyptic number.

78411025 is the 8855-th square number.

78411025 is the 4428-th centered octagonal number.

It is an amenable number.

78411025 is a deficient number, since it is larger than the sum of its proper divisors (51550058).

78411025 is a wasteful number, since it uses less digits than its factorization.

78411025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 46 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The cubic root of 78411025 is about 428.0150535509.

It can be divided in two parts, 784 and 11025, that multiplied together give a square (8643600 = 2940²).

The spelling of 78411025 in words is "seventy-eight million, four hundred eleven thousand, twenty-five".