78045678 has 24 divisors (see below), whose sum is σ = 169279968. Its totient is φ = 25987392.

The previous prime is 78045677. The next prime is 78045679. The reversal of 78045678 is 87654087.

78045678 is a `hidden beast` number, since 7 + 80 + 4 + 567 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (78045677) and next prime (78045679).

It is a super-2 number, since 2×78045678² = 12182255708959368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78045677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21675 + ... + 25017.

It is an arithmetic number, because the mean of its divisors is an integer number (7053332).

Almost surely, 2^78045678 is an apocalyptic number.

78045678 is an abundant number, since it is smaller than the sum of its proper divisors (91234290).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78045678 is a wasteful number, since it uses less digits than its factorization.

78045678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4648 (or 4645 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The square root of 78045678 is about 8834.3464953555. The cubic root of 78045678 is about 427.3492563827.

The spelling of 78045678 in words is "seventy-eight million, forty-five thousand, six hundred seventy-eight".