78044645 has 16 divisors (see below), whose sum is σ = 108076800. Its totient is φ = 52994304.

The previous prime is 78044633. The next prime is 78044657. The reversal of 78044645 is 54644087.

It is an interprime number because it is at equal distance from previous prime (78044633) and next prime (78044657).

It is a cyclic number.

It is not a de Polignac number, because 78044645 - 2⁸ = 78044389 is a prime.

It is a super-2 number, since 2×78044645² = 12181933226352050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 78044599 and 78044608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7220 + ... + 14429.

It is an arithmetic number, because the mean of its divisors is an integer number (6754800).

Almost surely, 2^78044645 is an apocalyptic number.

It is an amenable number.

78044645 is a deficient number, since it is larger than the sum of its proper divisors (30032155).

78044645 is a wasteful number, since it uses less digits than its factorization.

78044645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21764.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 78044645 is about 8834.2880301697. The cubic root of 78044645 is about 427.3473709324.

The spelling of 78044645 in words is "seventy-eight million, forty-four thousand, six hundred forty-five".