78293775 has 96 divisors (see below), whose sum is σ = 159989760. Its totient is φ = 32987520.

The previous prime is 78293749. The next prime is 78293777. The reversal of 78293775 is 57739287.

It is not a de Polignac number, because 78293775 - 2¹⁰ = 78292751 is a prime.

It is a super-2 number, since 2×78293775² = 12259830407501250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78293777) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 468742 + ... + 468908.

It is an arithmetic number, because the mean of its divisors is an integer number (1666560).

Almost surely, 2^78293775 is an apocalyptic number.

78293775 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

78293775 is an abundant number, since it is smaller than the sum of its proper divisors (81695985).

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

78293775 is a wasteful number, since it uses less digits than its factorization.

78293775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253 (or 248 counting only the distinct ones).

The product of its digits is 740880, while the sum is 48.

The square root of 78293775 is about 8848.3769698177. The cubic root of 78293775 is about 427.8016065261.

The spelling of 78293775 in words is "seventy-eight million, two hundred ninety-three thousand, seven hundred seventy-five".