821077450 has 12 divisors (see below), whose sum is σ = 1527204150. Its totient is φ = 328430960.

The previous prime is 821077427. The next prime is 821077513. The reversal of 821077450 is 54770128.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 492706809 + 328370641 = 22197^2 + 18121^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8210725 + ... + 8210824.

Almost surely, 2^821077450 is an apocalyptic number.

821077450 is a deficient number, since it is larger than the sum of its proper divisors (706126700).

821077450 is a wasteful number, since it uses less digits than its factorization.

821077450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16421561 (or 16421556 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 821077450 is about 28654.4490437349. The cubic root of 821077450 is about 936.3999351676.

The spelling of 821077450 in words is "eight hundred twenty-one million, seventy-seven thousand, four hundred fifty".