78961830 has 16 divisors (see below), whose sum is σ = 189508464. Its totient is φ = 21056480.

The previous prime is 78961823. The next prime is 78961849. The reversal of 78961830 is 3816987.

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1316001 + ... + 1316060.

It is an arithmetic number, because the mean of its divisors is an integer number (11844279).

Almost surely, 2^78961830 is an apocalyptic number.

78961830 is an abundant number, since it is smaller than the sum of its proper divisors (110546634).

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

78961830 is a wasteful number, since it uses less digits than its factorization.

78961830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2632071.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 78961830 is about 8886.0469276276. The cubic root of 78961830 is about 429.0149255026.

The spelling of 78961830 in words is "seventy-eight million, nine hundred sixty-one thousand, eight hundred thirty".