611402820 has 48 divisors (see below), whose sum is σ = 1956490368. Its totient is φ = 139749120.

The previous prime is 611402819. The next prime is 611402833. The reversal of 611402820 is 28204116.

It is a zygodrome in base 13.

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, 727441 + ... + 728280.

It is an arithmetic number, because the mean of its divisors is an integer number (40760216).

Almost surely, 2^611402820 is an apocalyptic number.

611402820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

611402820 is an abundant number, since it is smaller than the sum of its proper divisors (1345087548).

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

611402820 is a wasteful number, since it uses less digits than its factorization.

611402820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1455740 (or 1455738 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 611402820 is about 24726.5610225118. The cubic root of 611402820 is about 848.7422320370.

Adding to 611402820 its reverse (28204116), we get a palindrome (639606936).

The spelling of 611402820 in words is "six hundred eleven million, four hundred two thousand, eight hundred twenty".