79742420 has 12 divisors (see below), whose sum is σ = 167459124. Its totient is φ = 31896960.

The previous prime is 79742419. The next prime is 79742441. The reversal of 79742420 is 2424797.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 33339076 + 46403344 = 5774^2 + 6812^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1993541 + ... + 1993580.

It is an arithmetic number, because the mean of its divisors is an integer number (13954927).

Almost surely, 2^79742420 is an apocalyptic number.

It is an amenable number.

79742420 is an abundant number, since it is smaller than the sum of its proper divisors (87716704).

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

79742420 is a wasteful number, since it uses less digits than its factorization.

79742420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3987130 (or 3987128 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 79742420 is about 8929.8611411376. The cubic root of 79742420 is about 430.4239913866.

The spelling of 79742420 in words is "seventy-nine million, seven hundred forty-two thousand, four hundred twenty".