78451825 has 6 divisors (see below), whose sum is σ = 97280294. Its totient is φ = 62761440.

The previous prime is 78451811. The next prime is 78451831. The reversal of 78451825 is 52815487.

It can be written as a sum of positive squares in 3 ways, for example, as 712336 + 77739489 = 844^2 + 8817^2 .

It is not a de Polignac number, because 78451825 - 2⁷ = 78451697 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1569012 + ... + 1569061.

Almost surely, 2^78451825 is an apocalyptic number.

It is an amenable number.

78451825 is a deficient number, since it is larger than the sum of its proper divisors (18828469).

78451825 is a wasteful number, since it uses less digits than its factorization.

78451825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3138083 (or 3138078 counting only the distinct ones).

The product of its digits is 89600, while the sum is 40.

The square root of 78451825 is about 8857.3034835665. The cubic root of 78451825 is about 428.0892777483.

The spelling of 78451825 in words is "seventy-eight million, four hundred fifty-one thousand, eight hundred twenty-five".