78252447 has 64 divisors (see below), whose sum is σ = 135102464. Its totient is φ = 39191040.

The previous prime is 78252409. The next prime is 78252487. The reversal of 78252447 is 74425287.

It is not a de Polignac number, because 78252447 - 2⁷ = 78252319 is a prime.

It is a super-2 number, since 2×78252447² = 12246890922975618, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78252487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 616098 + ... + 616224.

It is an arithmetic number, because the mean of its divisors is an integer number (2110976).

Almost surely, 2^78252447 is an apocalyptic number.

78252447 is a deficient number, since it is larger than the sum of its proper divisors (56850017).

78252447 is a wasteful number, since it uses less digits than its factorization.

78252447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248.

The product of its digits is 125440, while the sum is 39.

The square root of 78252447 is about 8846.0413180134. The cubic root of 78252447 is about 427.7263204360.

The spelling of 78252447 in words is "seventy-eight million, two hundred fifty-two thousand, four hundred forty-seven".