771378020 has 48 divisors (see below), whose sum is σ = 1860152448. Its totient is φ = 263208960.

The previous prime is 771378011. The next prime is 771378073. The reversal of 771378020 is 20873177.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16484 + ... + 42596.

It is an arithmetic number, because the mean of its divisors is an integer number (38753176).

Almost surely, 2^771378020 is an apocalyptic number.

771378020 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 771378020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (930076224).

771378020 is an abundant number, since it is smaller than the sum of its proper divisors (1088774428).

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

771378020 is a wasteful number, since it uses less digits than its factorization.

771378020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26340 (or 26338 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 771378020 is about 27773.6929485440. The cubic root of 771378020 is about 917.1120926515.

The spelling of 771378020 in words is "seven hundred seventy-one million, three hundred seventy-eight thousand, twenty".