78331425 has 24 divisors (see below), whose sum is σ = 129768480. Its totient is φ = 41692800.

The previous prime is 78331417. The next prime is 78331439. The reversal of 78331425 is 52413387.

It is not a de Polignac number, because 78331425 - 2³ = 78331417 is a prime.

It is a super-2 number, since 2×78331425² = 12271624285061250, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60030 + ... + 61320.

It is an arithmetic number, because the mean of its divisors is an integer number (5407020).

Almost surely, 2^78331425 is an apocalyptic number.

78331425 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78331425 is a deficient number, since it is larger than the sum of its proper divisors (51437055).

78331425 is a wasteful number, since it uses less digits than its factorization.

78331425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113 (or 2108 counting only the distinct ones).

The product of its digits is 20160, while the sum is 33.

The square root of 78331425 is about 8850.5042229243. The cubic root of 78331425 is about 427.8701694455.

The spelling of 78331425 in words is "seventy-eight million, three hundred thirty-one thousand, four hundred twenty-five".