77202081 has 24 divisors (see below), whose sum is σ = 122451264. Its totient is φ = 46481760.

The previous prime is 77201989. The next prime is 77202113. The reversal of 77202081 is 18020277.

It is not a de Polignac number, because 77202081 - 2⁹ = 77201569 is a prime.

It is a super-2 number, since 2×77202081² = 11920322621461122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77202581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13060 + ... + 18026.

It is an arithmetic number, because the mean of its divisors is an integer number (5102136).

Almost surely, 2^77202081 is an apocalyptic number.

It is an amenable number.

77202081 is a deficient number, since it is larger than the sum of its proper divisors (45249183).

77202081 is a wasteful number, since it uses less digits than its factorization.

77202081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5141 (or 5138 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 77202081 is about 8786.4714760819. The cubic root of 77202081 is about 425.8039334467.

It can be divided in two parts, 7720 and 2081, that added together give a square (9801 = 99²).

The spelling of 77202081 in words is "seventy-seven million, two hundred two thousand, eighty-one".