821625730 has 16 divisors (see below), whose sum is σ = 1488723264. Its totient is φ = 326473200.

The previous prime is 821625719. The next prime is 821625751. The reversal of 821625730 is 37526128.

It is a happy number.

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, 270552 + ... + 273571.

It is an arithmetic number, because the mean of its divisors is an integer number (93045204).

Almost surely, 2^821625730 is an apocalyptic number.

821625730 is a deficient number, since it is larger than the sum of its proper divisors (667097534).

821625730 is a wasteful number, since it uses less digits than its factorization.

821625730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544281.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 821625730 is about 28664.0145478612. The cubic root of 821625730 is about 936.6083179136.

The spelling of 821625730 in words is "eight hundred twenty-one million, six hundred twenty-five thousand, seven hundred thirty".