77480240 has 20 divisors (see below), whose sum is σ = 180141744. Its totient is φ = 30992064.

The previous prime is 77480219. The next prime is 77480243. The reversal of 77480240 is 4208477.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 77480197 and 77480206.

It is not an unprimeable number, because it can be changed into a prime (77480243) 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, 484172 + ... + 484331.

Almost surely, 2^77480240 is an apocalyptic number.

It is an amenable number.

77480240 is an abundant number, since it is smaller than the sum of its proper divisors (102661504).

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

77480240 is a wasteful number, since it uses less digits than its factorization.

77480240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968516 (or 968510 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 32.

The square root of 77480240 is about 8802.2860666988. The cubic root of 77480240 is about 426.3147108378.

The spelling of 77480240 in words is "seventy-seven million, four hundred eighty thousand, two hundred forty".