78998061 has 8 divisors (see below), whose sum is σ = 106417024. Its totient is φ = 52122240.

The previous prime is 78998047. The next prime is 78998063. The reversal of 78998061 is 16089987.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78998061 - 2⁹ = 78997549 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78998061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78998063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135445 + ... + 136026.

It is an arithmetic number, because the mean of its divisors is an integer number (13302128).

Almost surely, 2^78998061 is an apocalyptic number.

It is an amenable number.

78998061 is a deficient number, since it is larger than the sum of its proper divisors (27418963).

78998061 is a wasteful number, since it uses less digits than its factorization.

78998061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271571.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 78998061 is about 8888.0853393743. The cubic root of 78998061 is about 429.0805321509.

The spelling of 78998061 in words is "seventy-eight million, nine hundred ninety-eight thousand, sixty-one".