78240075 has 12 divisors (see below), whose sum is σ = 129357048. Its totient is φ = 41728000.

The previous prime is 78240073. The next prime is 78240079. The reversal of 78240075 is 57004287.

It is not a de Polignac number, because 78240075 - 2¹ = 78240073 is a prime.

It is a super-2 number, since 2×78240075² = 12243018672011250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78240073) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 521526 + ... + 521675.

It is an arithmetic number, because the mean of its divisors is an integer number (10779754).

Almost surely, 2^78240075 is an apocalyptic number.

78240075 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78240075 is a deficient number, since it is larger than the sum of its proper divisors (51116973).

78240075 is a wasteful number, since it uses less digits than its factorization.

78240075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043214 (or 1043209 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 33.

The square root of 78240075 is about 8845.3419945189. The cubic root of 78240075 is about 427.7037775459.

The spelling of 78240075 in words is "seventy-eight million, two hundred forty thousand, seventy-five".