77609040 has 40 divisors (see below), whose sum is σ = 240588768. Its totient is φ = 20695680.

The previous prime is 77609039. The next prime is 77609057. The reversal of 77609040 is 4090677.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 77608992 and 77609010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161446 + ... + 161925.

Almost surely, 2^77609040 is an apocalyptic number.

It is an amenable number.

77609040 is an abundant number, since it is smaller than the sum of its proper divisors (162979728).

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

77609040 is a wasteful number, since it uses less digits than its factorization.

77609040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323387 (or 323381 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 77609040 is about 8809.5993098438. The cubic root of 77609040 is about 426.5508094718.

The spelling of 77609040 in words is "seventy-seven million, six hundred nine thousand, forty".