720021026 has 16 divisors (see below), whose sum is σ = 1193284224. Its totient is φ = 324101184.

The previous prime is 720021007. The next prime is 720021053. The reversal of 720021026 is 620120027.

It is a junction number, because it is equal to n+sod(n) for n = 720020989 and 720021007.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459590 + ... + 461153.

It is an arithmetic number, because the mean of its divisors is an integer number (74580264).

Almost surely, 2^720021026 is an apocalyptic number.

720021026 is a deficient number, since it is larger than the sum of its proper divisors (473263198).

720021026 is a wasteful number, since it uses less digits than its factorization.

720021026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920785.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 720021026 is about 26833.2075235146. The cubic root of 720021026 is about 896.2896738576.

Subtracting from 720021026 its reverse (620120027), we obtain a palindrome (99900999).

The spelling of 720021026 in words is "seven hundred twenty million, twenty-one thousand, twenty-six".