77861125 has 8 divisors (see below), whose sum is σ = 97170840. Its totient is φ = 62288800.

The previous prime is 77861117. The next prime is 77861129. The reversal of 77861125 is 52116877.

It can be written as a sum of positive squares in 4 ways, for example, as 8655364 + 69205761 = 2942^2 + 8319^2 .

It is not a de Polignac number, because 77861125 - 2³ = 77861117 is a prime.

It is a super-3 number, since 3×77861125³ (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 (77861129) 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, 311320 + ... + 311569.

It is an arithmetic number, because the mean of its divisors is an integer number (12146355).

Almost surely, 2^77861125 is an apocalyptic number.

It is an amenable number.

77861125 is a deficient number, since it is larger than the sum of its proper divisors (19309715).

77861125 is an equidigital number, since it uses as much as digits as its factorization.

77861125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622904 (or 622894 counting only the distinct ones).

The product of its digits is 23520, while the sum is 37.

The square root of 77861125 is about 8823.8951149705. The cubic root of 77861125 is about 427.0121425393.

It can be divided in two parts, 7786 and 1125, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 77861125 in words is "seventy-seven million, eight hundred sixty-one thousand, one hundred twenty-five".