78325731 has 16 divisors (see below), whose sum is σ = 126587520. Its totient is φ = 47469960.

The previous prime is 78325727. The next prime is 78325811. The reversal of 78325731 is 13752387.

78325731 is a `hidden beast` number, since 7 + 83 + 2 + 573 + 1 = 666.

It is not a de Polignac number, because 78325731 - 2² = 78325727 is a prime.

It is a super-2 number, since 2×78325731² = 12269840273368722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78325631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 131565 + ... + 132158.

It is an arithmetic number, because the mean of its divisors is an integer number (7911720).

Almost surely, 2^78325731 is an apocalyptic number.

78325731 is a deficient number, since it is larger than the sum of its proper divisors (48261789).

78325731 is a wasteful number, since it uses less digits than its factorization.

78325731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263743 (or 263737 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 78325731 is about 8850.1825404903. The cubic root of 78325731 is about 427.8598017386.

The spelling of 78325731 in words is "seventy-eight million, three hundred twenty-five thousand, seven hundred thirty-one".