79485840 has 240 divisors, whose sum is σ = 318908160. Its totient is φ = 18144000.

The previous prime is 79485823. The next prime is 79485841. The reversal of 79485840 is 4858497.

It is a tau number, because it is divible by the number of its divisors (240).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79485841) 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, 105465 + ... + 106215.

It is an arithmetic number, because the mean of its divisors is an integer number (1328784).

Almost surely, 2^79485840 is an apocalyptic number.

79485840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79485840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159454080).

79485840 is an abundant number, since it is smaller than the sum of its proper divisors (239422320).

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

79485840 is a wasteful number, since it uses less digits than its factorization.

79485840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 79485840 is about 8915.4831613323. The cubic root of 79485840 is about 429.9618498694.

The spelling of 79485840 in words is "seventy-nine million, four hundred eighty-five thousand, eight hundred forty".