78325729 has 4 divisors (see below), whose sum is σ = 78369984. Its totient is φ = 78281476.

The previous prime is 78325727. The next prime is 78325811. The reversal of 78325729 is 92752387.

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 a cyclic number.

It is not a de Polignac number, because 78325729 - 2¹ = 78325727 is a prime.

It is a super-2 number, since 2×78325729² = 12269839646762882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78325727) 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, 19357 + ... + 23050.

It is an arithmetic number, because the mean of its divisors is an integer number (19592496).

Almost surely, 2^78325729 is an apocalyptic number.

It is an amenable number.

78325729 is a deficient number, since it is larger than the sum of its proper divisors (44255).

78325729 is a wasteful number, since it uses less digits than its factorization.

78325729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44254.

The product of its digits is 211680, while the sum is 43.

The square root of 78325729 is about 8850.1824274983. The cubic root of 78325729 is about 427.8597980968.

The spelling of 78325729 in words is "seventy-eight million, three hundred twenty-five thousand, seven hundred twenty-nine".