919978722 has 80 divisors (see below), whose sum is σ = 2271857280. Its totient is φ = 276460128.

The previous prime is 919978691. The next prime is 919978739. The reversal of 919978722 is 227879919.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 85479 + ... + 95637.

It is an arithmetic number, because the mean of its divisors is an integer number (28398216).

Almost surely, 2^919978722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 919978722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1135928640).

919978722 is an abundant number, since it is smaller than the sum of its proper divisors (1351878558).

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

919978722 is a wasteful number, since it uses less digits than its factorization.

919978722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10229 (or 10220 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 54.

The square root of 919978722 is about 30331.1510167353. The cubic root of 919978722 is about 972.5813280650.

The spelling of 919978722 in words is "nine hundred nineteen million, nine hundred seventy-eight thousand, seven hundred twenty-two".