77401216 has 16 divisors (see below), whose sum is σ = 154197990. Its totient is φ = 38700544.

The previous prime is 77401213. The next prime is 77401217. The reversal of 77401216 is 61210477.

It can be written as a sum of positive squares in only one way, i.e., 62346816 + 15054400 = 7896^2 + 3880^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (77401213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 302221 + ... + 302476.

Almost surely, 2^77401216 is an apocalyptic number.

It is an amenable number.

77401216 is a deficient number, since it is larger than the sum of its proper divisors (76796774).

77401216 is an equidigital number, since it uses as much as digits as its factorization.

77401216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604711 (or 604699 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 77401216 is about 8797.7960876574. The cubic root of 77401216 is about 426.1697252533.

The spelling of 77401216 in words is "seventy-seven million, four hundred one thousand, two hundred sixteen".