772239420 has 144 divisors (see below), whose sum is σ = 2557376640. Its totient is φ = 195068736.

The previous prime is 772239379. The next prime is 772239487. The reversal of 772239420 is 24932277.

772239420 is a `hidden beast` number, since 7 + 7 + 223 + 9 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88159 + ... + 96521.

It is an arithmetic number, because the mean of its divisors is an integer number (17759560).

Almost surely, 2^772239420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 772239420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278688320).

772239420 is an abundant number, since it is smaller than the sum of its proper divisors (1785137220).

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

772239420 is a wasteful number, since it uses less digits than its factorization.

772239420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8406 (or 8392 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 36.

The square root of 772239420 is about 27789.1961020826. The cubic root of 772239420 is about 917.4533462061.

The spelling of 772239420 in words is "seven hundred seventy-two million, two hundred thirty-nine thousand, four hundred twenty".