77840040 has 64 divisors (see below), whose sum is σ = 237945600. Its totient is φ = 20364032.

The previous prime is 77840029. The next prime is 77840053. The reversal of 77840040 is 4004877.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 241 + ... + 12479.

It is an arithmetic number, because the mean of its divisors is an integer number (3717900).

Almost surely, 2^77840040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77840040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118972800).

77840040 is an abundant number, since it is smaller than the sum of its proper divisors (160105560).

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

77840040 is a wasteful number, since it uses less digits than its factorization.

77840040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12306 (or 12302 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 30.

The square root of 77840040 is about 8822.7002669251. The cubic root of 77840040 is about 426.9735937176.

The spelling of 77840040 in words is "seventy-seven million, eight hundred forty thousand, forty".