78961731 has 8 divisors (see below), whose sum is σ = 106051344. Its totient is φ = 52256640.

The previous prime is 78961721. The next prime is 78961741. The reversal of 78961731 is 13716987.

It is an interprime number because it is at equal distance from previous prime (78961721) and next prime (78961741).

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

It is not a de Polignac number, because 78961731 - 2⁶ = 78961667 is a prime.

It is a super-2 number, since 2×78961731² = 12469909925032722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78961721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95650 + ... + 96471.

It is an arithmetic number, because the mean of its divisors is an integer number (13256418).

Almost surely, 2^78961731 is an apocalyptic number.

78961731 is a deficient number, since it is larger than the sum of its proper divisors (27089613).

78961731 is a wasteful number, since it uses less digits than its factorization.

78961731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192261.

The product of its digits is 63504, while the sum is 42.

The square root of 78961731 is about 8886.0413570948. The cubic root of 78961731 is about 429.0147462072.

The spelling of 78961731 in words is "seventy-eight million, nine hundred sixty-one thousand, seven hundred thirty-one".