77444040 has 32 divisors (see below), whose sum is σ = 232332480. Its totient is φ = 20651712.

The previous prime is 77444033. The next prime is 77444041. The reversal of 77444040 is 4044477.

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 = 77443989 and 77444007.

It is not an unprimeable number, because it can be changed into a prime (77444041) 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, 322564 + ... + 322803.

It is an arithmetic number, because the mean of its divisors is an integer number (7260390).

Almost surely, 2^77444040 is an apocalyptic number.

It is an amenable number.

77444040 is an abundant number, since it is smaller than the sum of its proper divisors (154888440).

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

77444040 is a wasteful number, since it uses less digits than its factorization.

77444040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645381 (or 645377 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 30.

The square root of 77444040 is about 8800.2295424608. The cubic root of 77444040 is about 426.2483068247.

The spelling of 77444040 in words is "seventy-seven million, four hundred forty-four thousand, forty".