78214128925 has 24 divisors (see below), whose sum is σ = 98632089920. Its totient is φ = 61517750400.

The previous prime is 78214128917. The next prime is 78214128947. The reversal of 78214128925 is 52982141287.

It is a happy number.

It is not a de Polignac number, because 78214128925 - 2³ = 78214128917 is a prime.

It is a super-2 number, since 2×78214128925² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248665 + ... + 467185.

Almost surely, 2^78214128925 is an apocalyptic number.

It is an amenable number.

78214128925 is a deficient number, since it is larger than the sum of its proper divisors (20417960995).

78214128925 is a wasteful number, since it uses less digits than its factorization.

78214128925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218773 (or 218768 counting only the distinct ones).

The product of its digits is 645120, while the sum is 49.

The spelling of 78214128925 in words is "seventy-eight billion, two hundred fourteen million, one hundred twenty-eight thousand, nine hundred twenty-five".