78242788 has 12 divisors (see below), whose sum is σ = 147457660. Its totient is φ = 36112032.

The previous prime is 78242767. The next prime is 78242797. The reversal of 78242788 is 88724287.

It can be written as a sum of positive squares in 2 ways, for example, as 29354724 + 48888064 = 5418^2 + 6992^2 .

It is a super-2 number, since 2×78242788² = 12243867748025888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 752283 + ... + 752386.

Almost surely, 2^78242788 is an apocalyptic number.

It is an amenable number.

78242788 is a deficient number, since it is larger than the sum of its proper divisors (69214872).

78242788 is a wasteful number, since it uses less digits than its factorization.

78242788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504686 (or 1504684 counting only the distinct ones).

The product of its digits is 401408, while the sum is 46.

The square root of 78242788 is about 8845.4953507421. The cubic root of 78242788 is about 427.7087210778.

The spelling of 78242788 in words is "seventy-eight million, two hundred forty-two thousand, seven hundred eighty-eight".