91779406 has 8 divisors (see below), whose sum is σ = 142110144. Its totient is φ = 44409360.

The previous prime is 91779383. The next prime is 91779409. The reversal of 91779406 is 60497719.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91779409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740095 + ... + 740218.

It is an arithmetic number, because the mean of its divisors is an integer number (17763768).

Almost surely, 2^91779406 is an apocalyptic number.

91779406 is a deficient number, since it is larger than the sum of its proper divisors (50330738).

91779406 is a wasteful number, since it uses less digits than its factorization.

91779406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480346.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 91779406 is about 9580.1568880682. The cubic root of 91779406 is about 451.0746431289.

The spelling of 91779406 in words is "ninety-one million, seven hundred seventy-nine thousand, four hundred six".