720870990 has 64 divisors (see below), whose sum is σ = 1982762496. Its totient is φ = 164310912.

The previous prime is 720870973. The next prime is 720871003. The reversal of 720870990 is 99078027.

It is a super-4 number, since 4×720870990⁴ (a number of 37 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73729 + ... + 82931.

It is an arithmetic number, because the mean of its divisors is an integer number (30980664).

Almost surely, 2^720870990 is an apocalyptic number.

720870990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 720870990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (991381248).

720870990 is an abundant number, since it is smaller than the sum of its proper divisors (1261891506).

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

720870990 is a wasteful number, since it uses less digits than its factorization.

720870990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9593.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 720870990 is about 26849.0407649882. The cubic root of 720870990 is about 896.6422165190.

The spelling of 720870990 in words is "seven hundred twenty million, eight hundred seventy thousand, nine hundred ninety".