77641140 has 24 divisors (see below), whose sum is σ = 217395360. Its totient is φ = 20704288.

The previous prime is 77641129. The next prime is 77641147. The reversal of 77641140 is 4114677.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 77641098 and 77641107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77641147) 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, 646950 + ... + 647069.

It is an arithmetic number, because the mean of its divisors is an integer number (9058140).

Almost surely, 2^77641140 is an apocalyptic number.

It is an amenable number.

77641140 is an abundant number, since it is smaller than the sum of its proper divisors (139754220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77641140 is a wasteful number, since it uses less digits than its factorization.

77641140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294031 (or 1294029 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 77641140 is about 8811.4209977733. The cubic root of 77641140 is about 426.6096101547.

The spelling of 77641140 in words is "seventy-seven million, six hundred forty-one thousand, one hundred forty".