501022640 has 40 divisors (see below), whose sum is σ = 1233403200. Its totient is φ = 188619776.

The previous prime is 501022619. The next prime is 501022667. The reversal of 501022640 is 46220105.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 182840 + ... + 185559.

It is an arithmetic number, because the mean of its divisors is an integer number (30835080).

Almost surely, 2^501022640 is an apocalyptic number.

It is an amenable number.

501022640 is an abundant number, since it is smaller than the sum of its proper divisors (732380560).

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

501022640 is a wasteful number, since it uses less digits than its factorization.

501022640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368429 (or 368423 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 501022640 is about 22383.5350201884. The cubic root of 501022640 is about 794.2412707639.

Adding to 501022640 its reverse (46220105), we get a palindrome (547242745).

The spelling of 501022640 in words is "five hundred one million, twenty-two thousand, six hundred forty".