78002540 has 48 divisors (see below), whose sum is σ = 204228864. Its totient is φ = 24312000.

The previous prime is 78002513. The next prime is 78002609. The reversal of 78002540 is 4520087.

It is an unprimeable number.

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, 23786 + ... + 26865.

It is an arithmetic number, because the mean of its divisors is an integer number (4254768).

Almost surely, 2^78002540 is an apocalyptic number.

78002540 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78002540 is an abundant number, since it is smaller than the sum of its proper divisors (126226324).

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

78002540 is a wasteful number, since it uses less digits than its factorization.

78002540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50678 (or 50676 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 78002540 is about 8831.9046643405. The cubic root of 78002540 is about 427.2705059626.

The spelling of 78002540 in words is "seventy-eight million, two thousand, five hundred forty".