78278340 has 48 divisors (see below), whose sum is σ = 250492032. Its totient is φ = 17892096.

The previous prime is 78278339. The next prime is 78278341. The reversal of 78278340 is 4387287.

It is an interprime number because it is at equal distance from previous prime (78278339) and next prime (78278341).

It is a super-2 number, since 2×78278340² = 12254997026311200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78278341) 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 15 ways as a sum of consecutive naturals, for example, 92769 + ... + 93608.

It is an arithmetic number, because the mean of its divisors is an integer number (5218584).

Almost surely, 2^78278340 is an apocalyptic number.

78278340 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78278340 is an abundant number, since it is smaller than the sum of its proper divisors (172213692).

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

78278340 is a wasteful number, since it uses less digits than its factorization.

78278340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186396 (or 186394 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 78278340 is about 8847.5047329742. The cubic root of 78278340 is about 427.7734921080.

The spelling of 78278340 in words is "seventy-eight million, two hundred seventy-eight thousand, three hundred forty".