77135280 has 40 divisors (see below), whose sum is σ = 239120112. Its totient is φ = 20569344.

The previous prime is 77135263. The next prime is 77135287. The reversal of 77135280 is 8253177.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (77135287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160459 + ... + 160938.

Almost surely, 2^77135280 is an apocalyptic number.

It is an amenable number.

77135280 is an abundant number, since it is smaller than the sum of its proper divisors (161984832).

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

77135280 is a wasteful number, since it uses less digits than its factorization.

77135280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321413 (or 321407 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 77135280 is about 8782.6692981120. The cubic root of 77135280 is about 425.6810855644.

The spelling of 77135280 in words is "seventy-seven million, one hundred thirty-five thousand, two hundred eighty".