78727770 has 96 divisors (see below), whose sum is σ = 224887104. Its totient is φ = 18950400.

The previous prime is 78727763. The next prime is 78727777. The reversal of 78727770 is 7772787.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78727763) and next prime (78727777).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (78727777) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 278049 + ... + 278331.

It is an arithmetic number, because the mean of its divisors is an integer number (2342574).

Almost surely, 2^78727770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78727770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112443552).

78727770 is an abundant number, since it is smaller than the sum of its proper divisors (146159334).

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

78727770 is a wasteful number, since it uses less digits than its factorization.

78727770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 585 counting only the distinct ones).

The product of its (nonzero) digits is 268912, while the sum is 45.

The square root of 78727770 is about 8872.8670676394. The cubic root of 78727770 is about 428.5906081893.

It can be divided in two parts, 78727 and 770, that added together give a palindrome (79497).

The spelling of 78727770 in words is "seventy-eight million, seven hundred twenty-seven thousand, seven hundred seventy".