79489890 has 64 divisors (see below), whose sum is σ = 218833920. Its totient is φ = 20511360.

The previous prime is 79489853. The next prime is 79489931. The reversal of 79489890 is 9898497.

79489890 is a `hidden beast` number, since 79 + 489 + 8 + 90 = 666.

It is a super-2 number, since 2×79489890² = 12637285224424200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3622 + ... + 13118.

It is an arithmetic number, because the mean of its divisors is an integer number (3419280).

Almost surely, 2^79489890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79489890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109416960).

79489890 is an abundant number, since it is smaller than the sum of its proper divisors (139344030).

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

79489890 is a wasteful number, since it uses less digits than its factorization.

79489890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9544 (or 9538 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 79489890 is about 8915.7102913901. The cubic root of 79489890 is about 429.9691522850.

The spelling of 79489890 in words is "seventy-nine million, four hundred eighty-nine thousand, eight hundred ninety".