79720017078 has 32 divisors (see below), whose sum is σ = 171726895872. Its totient is φ = 24526058400.

The previous prime is 79720017061. The next prime is 79720017121. The reversal of 79720017078 is 87071002797.

It is a super-2 number, since 2×79720017078² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 579933 + ... + 704103.

It is an arithmetic number, because the mean of its divisors is an integer number (5366465496).

Almost surely, 2^79720017078 is an apocalyptic number.

79720017078 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

79720017078 is an abundant number, since it is smaller than the sum of its proper divisors (92006878794).

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

79720017078 is a wasteful number, since it uses less digits than its factorization.

79720017078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132420.

The product of its (nonzero) digits is 345744, while the sum is 48.

The spelling of 79720017078 in words is "seventy-nine billion, seven hundred twenty million, seventeen thousand, seventy-eight".