78038775 has 24 divisors (see below), whose sum is σ = 143361360. Its totient is φ = 41620320.

The previous prime is 78038771. The next prime is 78038791. The reversal of 78038775 is 57783087.

It is not a de Polignac number, because 78038775 - 2² = 78038771 is a prime.

It is a super-3 number, since 3×78038775³ (a number of 25 digits) contains 333 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 78038775.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78038771) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 57132 + ... + 58481.

It is an arithmetic number, because the mean of its divisors is an integer number (5973390).

Almost surely, 2^78038775 is an apocalyptic number.

78038775 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78038775 is a deficient number, since it is larger than the sum of its proper divisors (65322585).

78038775 is a wasteful number, since it uses less digits than its factorization.

78038775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115632 (or 115621 counting only the distinct ones).

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

The square root of 78038775 is about 8833.9557956784. The cubic root of 78038775 is about 427.3366565865.

The spelling of 78038775 in words is "seventy-eight million, thirty-eight thousand, seven hundred seventy-five".