78402340 has 24 divisors (see below), whose sum is σ = 165392640. Its totient is φ = 31218528.

The previous prime is 78402323. The next prime is 78402347. The reversal of 78402340 is 4320487.

It is a super-2 number, since 2×78402340² = 12293853834951200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78402299 and 78402308.

It is not an unprimeable number, because it can be changed into a prime (78402347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4330 + ... + 13249.

It is an arithmetic number, because the mean of its divisors is an integer number (6891360).

Almost surely, 2^78402340 is an apocalyptic number.

It is an amenable number.

78402340 is an abundant number, since it is smaller than the sum of its proper divisors (86990300).

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

78402340 is a wasteful number, since it uses less digits than its factorization.

78402340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17811 (or 17809 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 78402340 is about 8854.5095855163. The cubic root of 78402340 is about 427.9992502971. Note that the first 3 decimals are identical.

The spelling of 78402340 in words is "seventy-eight million, four hundred two thousand, three hundred forty".