77870472 has 96 divisors (see below), whose sum is σ = 210724800. Its totient is φ = 23970816.

The previous prime is 77870467. The next prime is 77870473. The reversal of 77870472 is 27407877.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (77870473) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 714354 + ... + 714462.

It is an arithmetic number, because the mean of its divisors is an integer number (2195050).

Almost surely, 2^77870472 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 77870472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105362400).

77870472 is an abundant number, since it is smaller than the sum of its proper divisors (132854328).

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

77870472 is a wasteful number, since it uses less digits than its factorization.

77870472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 234 counting only the distinct ones).

The product of its (nonzero) digits is 153664, while the sum is 42.

The square root of 77870472 is about 8824.4247404576. The cubic root of 77870472 is about 427.0292290412.

The spelling of 77870472 in words is "seventy-seven million, eight hundred seventy thousand, four hundred seventy-two".