10091420778 has 16 divisors (see below), whose sum is σ = 20368006560. Its totient is φ = 3332946096.

The previous prime is 10091420761. The next prime is 10091420797. The reversal of 10091420778 is 87702419001.

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, 7714500 + ... + 7715807.

It is an arithmetic number, because the mean of its divisors is an integer number (1273000410).

Almost surely, 2^10091420778 is an apocalyptic number.

10091420778 is an abundant number, since it is smaller than the sum of its proper divisors (10276585782).

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

10091420778 is a wasteful number, since it uses less digits than its factorization.

10091420778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15430421.

The product of its (nonzero) digits is 28224, while the sum is 39.

Adding to 10091420778 its reverse (87702419001), we get a palindrome (97793839779).

The spelling of 10091420778 in words is "ten billion, ninety-one million, four hundred twenty thousand, seven hundred seventy-eight".