77920252 has 6 divisors (see below), whose sum is σ = 136360448. Its totient is φ = 38960124.

The previous prime is 77920237. The next prime is 77920259. The reversal of 77920252 is 25202977.

It is a super-3 number, since 3×77920252³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77920259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9740028 + ... + 9740035.

Almost surely, 2^77920252 is an apocalyptic number.

It is an amenable number.

77920252 is a deficient number, since it is larger than the sum of its proper divisors (58440196).

77920252 is a wasteful number, since it uses less digits than its factorization.

77920252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19480067 (or 19480065 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 77920252 is about 8827.2448702865. The cubic root of 77920252 is about 427.1202048473.

The spelling of 77920252 in words is "seventy-seven million, nine hundred twenty thousand, two hundred fifty-two".