77744340 has 48 divisors (see below), whose sum is σ = 241872960. Its totient is φ = 20731680.

The previous prime is 77744279. The next prime is 77744353. The reversal of 77744340 is 4344777.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 77744295 and 77744304.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71446 + ... + 72525.

It is an arithmetic number, because the mean of its divisors is an integer number (5039020).

Almost surely, 2^77744340 is an apocalyptic number.

It is an amenable number.

77744340 is an abundant number, since it is smaller than the sum of its proper divisors (164128620).

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

77744340 is a wasteful number, since it uses less digits than its factorization.

77744340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143989 (or 143981 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 36.

The square root of 77744340 is about 8817.2750892779. The cubic root of 77744340 is about 426.7985418635.

The spelling of 77744340 in words is "seventy-seven million, seven hundred forty-four thousand, three hundred forty".