78087402 has 20 divisors (see below), whose sum is σ = 174973986. Its totient is φ = 26029080.

The previous prime is 78087379. The next prime is 78087403. The reversal of 78087402 is 20478087.

It can be written as a sum of positive squares in only one way, i.e., 77951241 + 136161 = 8829^2 + 369^2 .

It is a super-2 number, since 2×78087402² = 12195284702219208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78087403) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 240849 + ... + 241172.

Almost surely, 2^78087402 is an apocalyptic number.

78087402 is an abundant number, since it is smaller than the sum of its proper divisors (96886584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78087402 is a wasteful number, since it uses less digits than its factorization.

78087402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482035 (or 482026 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 78087402 is about 8836.7076448189. The cubic root of 78087402 is about 427.4253978778.

The spelling of 78087402 in words is "seventy-eight million, eighty-seven thousand, four hundred two".