77690144 has 24 divisors (see below), whose sum is σ = 174803328. Its totient is φ = 33295680.

The previous prime is 77690143. The next prime is 77690191. The reversal of 77690144 is 44109677.

It is a junction number, because it is equal to n+sod(n) for n = 77690098 and 77690107.

It is not an unprimeable number, because it can be changed into a prime (77690143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 173192 + ... + 173639.

It is an arithmetic number, because the mean of its divisors is an integer number (7283472).

Almost surely, 2^77690144 is an apocalyptic number.

It is an amenable number.

77690144 is an abundant number, since it is smaller than the sum of its proper divisors (97113184).

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

77690144 is a wasteful number, since it uses less digits than its factorization.

77690144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346848 (or 346840 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 77690144 is about 8814.2012684077. The cubic root of 77690144 is about 426.6993442854.

The spelling of 77690144 in words is "seventy-seven million, six hundred ninety thousand, one hundred forty-four".