78497645 has 24 divisors (see below), whose sum is σ = 100410264. Its totient is φ = 58900608.

The previous prime is 78497641. The next prime is 78497651. The reversal of 78497645 is 54679487.

It can be written as a sum of positive squares in 4 ways, for example, as 104329 + 78393316 = 323^2 + 8854^2 .

It is not a de Polignac number, because 78497645 - 2² = 78497641 is a prime.

It is a super-3 number, since 3×78497645³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78497593 and 78497602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78497641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 283247 + ... + 283523.

It is an arithmetic number, because the mean of its divisors is an integer number (4183761).

Almost surely, 2^78497645 is an apocalyptic number.

It is an amenable number.

78497645 is a deficient number, since it is larger than the sum of its proper divisors (21912619).

78497645 is a wasteful number, since it uses less digits than its factorization.

78497645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 458 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 50.

The square root of 78497645 is about 8859.8896719993. The cubic root of 78497645 is about 428.1726037606.

The spelling of 78497645 in words is "seventy-eight million, four hundred ninety-seven thousand, six hundred forty-five".