78075321 has 4 divisors (see below), whose sum is σ = 104100432. Its totient is φ = 52050212.

The previous prime is 78075311. The next prime is 78075331. The reversal of 78075321 is 12357087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (78075311) and next prime (78075331).

It is a cyclic number.

It is not a de Polignac number, because 78075321 - 2⁵ = 78075289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78075311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13012551 + ... + 13012556.

It is an arithmetic number, because the mean of its divisors is an integer number (26025108).

Almost surely, 2^78075321 is an apocalyptic number.

It is an amenable number.

78075321 is a deficient number, since it is larger than the sum of its proper divisors (26025111).

78075321 is a wasteful number, since it uses less digits than its factorization.

78075321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26025110.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 78075321 is about 8836.0240493109. The cubic root of 78075321 is about 427.4033542343.

The spelling of 78075321 in words is "seventy-eight million, seventy-five thousand, three hundred twenty-one".