78617245 has 16 divisors (see below), whose sum is σ = 109186560. Its totient is φ = 53224704.

The previous prime is 78617237. The next prime is 78617249. The reversal of 78617245 is 54271687.

It is a cyclic number.

It is not a de Polignac number, because 78617245 - 2³ = 78617237 is a prime.

It is a super-2 number, since 2×78617245² = 12361342422780050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78617198 and 78617207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78617249) 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, 11452 + ... + 16981.

It is an arithmetic number, because the mean of its divisors is an integer number (6824160).

Almost surely, 2^78617245 is an apocalyptic number.

It is an amenable number.

78617245 is a deficient number, since it is larger than the sum of its proper divisors (30569315).

78617245 is a wasteful number, since it uses less digits than its factorization.

78617245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28524.

The product of its digits is 94080, while the sum is 40.

The square root of 78617245 is about 8866.6366227561. The cubic root of 78617245 is about 428.3899498038.

The spelling of 78617245 in words is "seventy-eight million, six hundred seventeen thousand, two hundred forty-five".