765351990 has 120 divisors (see below), whose sum is σ = 2228825808. Its totient is φ = 188360640.

The previous prime is 765351989. The next prime is 765351997. The reversal of 765351990 is 99153567.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (765351997) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 134095 + ... + 139685.

Almost surely, 2^765351990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 765351990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1114412904).

765351990 is an abundant number, since it is smaller than the sum of its proper divisors (1463473818).

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

765351990 is a wasteful number, since it uses less digits than its factorization.

765351990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5636 (or 5614 counting only the distinct ones).

The product of its (nonzero) digits is 255150, while the sum is 45.

The square root of 765351990 is about 27664.9957527559. The cubic root of 765351990 is about 914.7176769402.

The spelling of 765351990 in words is "seven hundred sixty-five million, three hundred fifty-one thousand, nine hundred ninety".