78355225 has 12 divisors (see below), whose sum is σ = 104634796. Its totient is φ = 57862080.

The previous prime is 78355219. The next prime is 78355229. The reversal of 78355225 is 52255387.

It can be written as a sum of positive squares in 6 ways, for example, as 7441984 + 70913241 = 2728^2 + 8421^2 .

It is not a de Polignac number, because 78355225 - 2⁷ = 78355097 is a prime.

It is a super-2 number, since 2×78355225² = 12279082569601250, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78355229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 120222 + ... + 120871.

Almost surely, 2^78355225 is an apocalyptic number.

It is an amenable number.

78355225 is a deficient number, since it is larger than the sum of its proper divisors (26279571).

78355225 is a wasteful number, since it uses less digits than its factorization.

78355225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241116 (or 241111 counting only the distinct ones).

The product of its digits is 84000, while the sum is 37.

The square root of 78355225 is about 8851.8486769714. The cubic root of 78355225 is about 427.9134993473.

The spelling of 78355225 in words is "seventy-eight million, three hundred fifty-five thousand, two hundred twenty-five".