78717425 has 6 divisors (see below), whose sum is σ = 97609638. Its totient is φ = 62973920.

The previous prime is 78717421. The next prime is 78717451. The reversal of 78717425 is 52471787.

It can be written as a sum of positive squares in 3 ways, for example, as 5041 + 78712384 = 71^2 + 8872^2 .

It is not a de Polignac number, because 78717425 - 2² = 78717421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78717421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1574324 + ... + 1574373.

It is an arithmetic number, because the mean of its divisors is an integer number (16268273).

Almost surely, 2^78717425 is an apocalyptic number.

It is an amenable number.

78717425 is a deficient number, since it is larger than the sum of its proper divisors (18892213).

78717425 is a wasteful number, since it uses less digits than its factorization.

78717425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148707 (or 3148702 counting only the distinct ones).

The product of its digits is 109760, while the sum is 41.

The square root of 78717425 is about 8872.2840914840. The cubic root of 78717425 is about 428.5718347880.

The spelling of 78717425 in words is "seventy-eight million, seven hundred seventeen thousand, four hundred twenty-five".