78304997 has 8 divisors (see below), whose sum is σ = 79433112. Its totient is φ = 77184000.

The previous prime is 78304991. The next prime is 78305011. The reversal of 78304997 is 79940387.

It can be written as a sum of positive squares in 4 ways, for example, as 58997761 + 19307236 = 7681^2 + 4394^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78304997 - 2²² = 74110693 is a prime.

It is a super-2 number, since 2×78304997² = 12263345110340018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78304991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22733 + ... + 25949.

It is an arithmetic number, because the mean of its divisors is an integer number (9929139).

Almost surely, 2^78304997 is an apocalyptic number.

It is an amenable number.

78304997 is a deficient number, since it is larger than the sum of its proper divisors (1128115).

78304997 is a wasteful number, since it uses less digits than its factorization.

78304997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3559.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 78304997 is about 8849.0110746908. The cubic root of 78304997 is about 427.8220447634.

The spelling of 78304997 in words is "seventy-eight million, three hundred four thousand, nine hundred ninety-seven".