78268140 has 48 divisors (see below), whose sum is σ = 243502560. Its totient is φ = 20871360.

The previous prime is 78268133. The next prime is 78268147. The reversal of 78268140 is 4186287.

It is an interprime number because it is at equal distance from previous prime (78268133) and next prime (78268147).

It is a super-2 number, since 2×78268140² = 12251803478119200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 78268095 and 78268104.

It is not an unprimeable number, because it can be changed into a prime (78268147) 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, 71931 + ... + 73010.

It is an arithmetic number, because the mean of its divisors is an integer number (5072970).

Almost surely, 2^78268140 is an apocalyptic number.

It is an amenable number.

78268140 is an abundant number, since it is smaller than the sum of its proper divisors (165234420).

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

78268140 is a wasteful number, since it uses less digits than its factorization.

78268140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144959 (or 144951 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 78268140 is about 8846.9282804824. The cubic root of 78268140 is about 427.7549110669.

The spelling of 78268140 in words is "seventy-eight million, two hundred sixty-eight thousand, one hundred forty".