86721426 has 72 divisors (see below), whose sum is σ = 213808140. Its totient is φ = 25354560.

The previous prime is 86721413. The next prime is 86721461. The reversal of 86721426 is 62412768.

It can be written as a sum of positive squares in 2 ways, for example, as 76475025 + 10246401 = 8745^2 + 3201^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 62476 + ... + 63848.

Almost surely, 2^86721426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 86721426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106904070).

86721426 is an abundant number, since it is smaller than the sum of its proper divisors (127086714).

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

86721426 is a wasteful number, since it uses less digits than its factorization.

86721426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1432 (or 1418 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 86721426 is about 9312.4339460745. The cubic root of 86721426 is about 442.6313160015.

The spelling of 86721426 in words is "eighty-six million, seven hundred twenty-one thousand, four hundred twenty-six".