78387075 has 48 divisors (see below), whose sum is σ = 155094240. Its totient is φ = 38586240.

The previous prime is 78387061. The next prime is 78387077. The reversal of 78387075 is 57078387.

It is not a de Polignac number, because 78387075 - 2⁶ = 78387011 is a prime.

It is a super-2 number, since 2×78387075² = 12289067054111250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78387075.

It is not an unprimeable number, because it can be changed into a prime (78387077) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4309 + ... + 13241.

It is an arithmetic number, because the mean of its divisors is an integer number (3231130).

Almost surely, 2^78387075 is an apocalyptic number.

78387075 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78387075 is a deficient number, since it is larger than the sum of its proper divisors (76707165).

78387075 is a wasteful number, since it uses less digits than its factorization.

78387075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8965 (or 8954 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 45.

The square root of 78387075 is about 8853.6475534098. The cubic root of 78387075 is about 427.9714712256.

The spelling of 78387075 in words is "seventy-eight million, three hundred eighty-seven thousand, seventy-five".