77220265 has 8 divisors (see below), whose sum is σ = 93145608. Its totient is φ = 61455360.

The previous prime is 77220263. The next prime is 77220271. The reversal of 77220265 is 56202277.

It can be written as a sum of positive squares in 4 ways, for example, as 1373584 + 75846681 = 1172^2 + 8709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77220265 - 2¹ = 77220263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77220263) 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, 39046 + ... + 40975.

It is an arithmetic number, because the mean of its divisors is an integer number (11643201).

Almost surely, 2^77220265 is an apocalyptic number.

It is an amenable number.

77220265 is a deficient number, since it is larger than the sum of its proper divisors (15925343).

77220265 is a wasteful number, since it uses less digits than its factorization.

77220265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80219.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 77220265 is about 8787.5061877645. The cubic root of 77220265 is about 425.8373617810.

The spelling of 77220265 in words is "seventy-seven million, two hundred twenty thousand, two hundred sixty-five".