77309460 has 36 divisors (see below), whose sum is σ = 234505908. Its totient is φ = 20615808.

The previous prime is 77309429. The next prime is 77309473. The reversal of 77309460 is 6490377.

It can be written as a sum of positive squares in 2 ways, for example, as 41525136 + 35784324 = 6444^2 + 5982^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 214569 + ... + 214928.

It is an arithmetic number, because the mean of its divisors is an integer number (6514053).

Almost surely, 2^77309460 is an apocalyptic number.

It is an amenable number.

77309460 is an abundant number, since it is smaller than the sum of its proper divisors (157196448).

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

77309460 is a wasteful number, since it uses less digits than its factorization.

77309460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429512 (or 429507 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 36.

The square root of 77309460 is about 8792.5798261944. The cubic root of 77309460 is about 426.0012563608.

The spelling of 77309460 in words is "seventy-seven million, three hundred nine thousand, four hundred sixty".