78577542 has 12 divisors (see below), whose sum is σ = 170251380. Its totient is φ = 26192508.

The previous prime is 78577537. The next prime is 78577547. The reversal of 78577542 is 24577587.

78577542 is a `hidden beast` number, since 78 + 577 + 5 + 4 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (78577537) and next prime (78577547).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78577547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2182692 + ... + 2182727.

It is an arithmetic number, because the mean of its divisors is an integer number (14187615).

Almost surely, 2^78577542 is an apocalyptic number.

78577542 is an abundant number, since it is smaller than the sum of its proper divisors (91673838).

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

78577542 is a wasteful number, since it uses less digits than its factorization.

78577542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4365427 (or 4365424 counting only the distinct ones).

The product of its digits is 548800, while the sum is 45.

The square root of 78577542 is about 8864.3974414508. The cubic root of 78577542 is about 428.3178230071.

Adding to 78577542 its sum of digits (45), we get a palindrome (78577587).

The spelling of 78577542 in words is "seventy-eight million, five hundred seventy-seven thousand, five hundred forty-two".