78057280 has 56 divisors (see below), whose sum is σ = 212433408. Its totient is φ = 26761728.

The previous prime is 78057269. The next prime is 78057281. The reversal of 78057280 is 8275087.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78057281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15184 + ... + 19663.

Almost surely, 2^78057280 is an apocalyptic number.

78057280 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78057280 is an abundant number, since it is smaller than the sum of its proper divisors (134376128).

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

78057280 is a wasteful number, since it uses less digits than its factorization.

78057280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34871 (or 34861 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 37.

The square root of 78057280 is about 8835.0031126197. The cubic root of 78057280 is about 427.3704314199.

The spelling of 78057280 in words is "seventy-eight million, fifty-seven thousand, two hundred eighty".