86121780 has 24 divisors (see below), whose sum is σ = 241141152. Its totient is φ = 22965792.

The previous prime is 86121773. The next prime is 86121799. The reversal of 86121780 is 8712168.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717622 + ... + 717741.

It is an arithmetic number, because the mean of its divisors is an integer number (10047548).

Almost surely, 2^86121780 is an apocalyptic number.

It is an amenable number.

86121780 is an abundant number, since it is smaller than the sum of its proper divisors (155019372).

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

86121780 is a wasteful number, since it uses less digits than its factorization.

86121780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435375 (or 1435373 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 86121780 is about 9280.1821102821. The cubic root of 86121780 is about 441.6087458557.

The spelling of 86121780 in words is "eighty-six million, one hundred twenty-one thousand, seven hundred eighty".