77201604 has 18 divisors (see below), whose sum is σ = 195148590. Its totient is φ = 25733856.

The previous prime is 77201603. The next prime is 77201609. The reversal of 77201604 is 40610277.

It can be written as a sum of positive squares in only one way, i.e., 74132100 + 3069504 = 8610^2 + 1752^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (77201603) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1072209 + ... + 1072280.

Almost surely, 2^77201604 is an apocalyptic number.

It is an amenable number.

77201604 is an abundant number, since it is smaller than the sum of its proper divisors (117946986).

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

77201604 is a wasteful number, since it uses less digits than its factorization.

77201604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2144499 (or 2144494 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 77201604 is about 8786.4443320378. Note that the first 3 decimals coincide. The cubic root of 77201604 is about 425.8030564890.

The spelling of 77201604 in words is "seventy-seven million, two hundred one thousand, six hundred four".