787780020 has 48 divisors (see below), whose sum is σ = 2207132928. Its totient is φ = 209946240.

The previous prime is 787780013. The next prime is 787780031. The reversal of 787780020 is 20087787.

It is a super-2 number, since 2×787780020² = 1241194719822400800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134350 + ... + 140090.

It is an arithmetic number, because the mean of its divisors is an integer number (45981936).

Almost surely, 2^787780020 is an apocalyptic number.

It is an amenable number.

787780020 is an abundant number, since it is smaller than the sum of its proper divisors (1419352908).

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

787780020 is a wasteful number, since it uses less digits than its factorization.

787780020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8040 (or 8038 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 39.

The square root of 787780020 is about 28067.4191902284. The cubic root of 787780020 is about 923.5668168708.

The spelling of 787780020 in words is "seven hundred eighty-seven million, seven hundred eighty thousand, twenty".