78873914025 has 75 divisors (see below), whose sum is σ = 147974853191. Its totient is φ = 41533605360.

The previous prime is 78873914023. The next prime is 78873914039. The reversal of 78873914025 is 52041937887.

It is a happy number.

The square root of 78873914025 is 280845.

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

78873914025 is a `hidden beast` number, since 7 + 88 + 73 + 91 + 402 + 5 = 666.

It can be written as a sum of positive squares in only one way, i.e., 28394609049 + 50479304976 = 168507^2 + 224676^2 .

It is a tau number, because it is divible by the number of its divisors (75).

It is not a de Polignac number, because 78873914025 - 2¹ = 78873914023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78873914023) by changing a digit.

It is a polite number, since it can be written in 74 ways as a sum of consecutive naturals, for example, 998403936 + ... + 998404014.

Almost surely, 2^78873914025 is an apocalyptic number.

78873914025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78873914025 is the 280845-th square number.

78873914025 is the 140423-rd centered octagonal number.

It is an amenable number.

78873914025 is a deficient number, since it is larger than the sum of its proper divisors (69100939166).

78873914025 is an frugal number, since it uses more digits than its factorization.

78873914025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 3386880, while the sum is 54.

The spelling of 78873914025 in words is "seventy-eight billion, eight hundred seventy-three million, nine hundred fourteen thousand, twenty-five".