77389225 has 12 divisors (see below), whose sum is σ = 96578764. Its totient is φ = 61513920.

The previous prime is 77389201. The next prime is 77389229. The reversal of 77389225 is 52298377.

It can be written as a sum of positive squares in 6 ways, for example, as 18774889 + 58614336 = 4333^2 + 7656^2 .

It is not a de Polignac number, because 77389225 - 2⁷ = 77389097 is a prime.

It is a super-2 number, since 2×77389225² = 11978184292201250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77389229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5934 + ... + 13783.

Almost surely, 2^77389225 is an apocalyptic number.

It is an amenable number.

77389225 is a deficient number, since it is larger than the sum of its proper divisors (19189539).

77389225 is a wasteful number, since it uses less digits than its factorization.

77389225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19884 (or 19879 counting only the distinct ones).

The product of its digits is 211680, while the sum is 43.

The square root of 77389225 is about 8797.1145837712. The cubic root of 77389225 is about 426.1477167055.

It can be divided in two parts, 773 and 89225, that added together give a palindrome (89998).

The spelling of 77389225 in words is "seventy-seven million, three hundred eighty-nine thousand, two hundred twenty-five".