771978204 has 54 divisors (see below), whose sum is σ = 1979890640. Its totient is φ = 253581120.

The previous prime is 771978197. The next prime is 771978223. The reversal of 771978204 is 402879177.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 771978204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1481464 + ... + 1481984.

Almost surely, 2^771978204 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 771978204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (989945320).

771978204 is an abundant number, since it is smaller than the sum of its proper divisors (1207912436).

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

771978204 is a wasteful number, since it uses less digits than its factorization.

771978204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131 (or 605 counting only the distinct ones).

The product of its (nonzero) digits is 197568, while the sum is 45.

The square root of 771978204 is about 27784.4957485285. The cubic root of 771978204 is about 917.3498892929.

The spelling of 771978204 in words is "seven hundred seventy-one million, nine hundred seventy-eight thousand, two hundred four".