78351844 has 12 divisors (see below), whose sum is σ = 145181484. Its totient is φ = 36871424.

The previous prime is 78351841. The next prime is 78351851. The reversal of 78351844 is 44815387.

It can be written as a sum of positive squares in 2 ways, for example, as 39538944 + 38812900 = 6288^2 + 6230^2 .

It is a super-2 number, since 2×78351844² = 12278022916400672, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78351797 and 78351806.

It is not an unprimeable number, because it can be changed into a prime (78351841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 576049 + ... + 576184.

It is an arithmetic number, because the mean of its divisors is an integer number (12098457).

Almost surely, 2^78351844 is an apocalyptic number.

It is an amenable number.

78351844 is a deficient number, since it is larger than the sum of its proper divisors (66829640).

78351844 is a wasteful number, since it uses less digits than its factorization.

78351844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152254 (or 1152252 counting only the distinct ones).

The product of its digits is 107520, while the sum is 40.

The square root of 78351844 is about 8851.6576978552. The cubic root of 78351844 is about 427.9073444871.

The spelling of 78351844 in words is "seventy-eight million, three hundred fifty-one thousand, eight hundred forty-four".