77454640 has 40 divisors (see below), whose sum is σ = 189563760. Its totient is φ = 29350656.

The previous prime is 77454631. The next prime is 77454673. The reversal of 77454640 is 4645477.

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

It is a self number, because there is not a number n which added to its sum of digits gives 77454640.

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, 23959 + ... + 26998.

It is an arithmetic number, because the mean of its divisors is an integer number (4739094).

Almost surely, 2^77454640 is an apocalyptic number.

It is an amenable number.

77454640 is an abundant number, since it is smaller than the sum of its proper divisors (112109120).

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

77454640 is a wasteful number, since it uses less digits than its factorization.

77454640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50989 (or 50983 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 37.

The square root of 77454640 is about 8800.8317788718. The cubic root of 77454640 is about 426.2677532359.

The spelling of 77454640 in words is "seventy-seven million, four hundred fifty-four thousand, six hundred forty".