51620090 has 16 divisors (see below), whose sum is σ = 93837960. Its totient is φ = 20443200.

The previous prime is 51620033. The next prime is 51620099. The reversal of 51620090 is 9002615.

It can be written as a sum of positive squares in 4 ways, for example, as 50822641 + 797449 = 7129^2 + 893^2 .

It is not an unprimeable number, because it can be changed into a prime (51620099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24545 + ... + 26564.

Almost surely, 2^51620090 is an apocalyptic number.

51620090 is a deficient number, since it is larger than the sum of its proper divisors (42217870).

51620090 is a wasteful number, since it uses less digits than its factorization.

51620090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51217.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 51620090 is about 7184.7122419760. The cubic root of 51620090 is about 372.3399068818.

The spelling of 51620090 in words is "fifty-one million, six hundred twenty thousand, ninety".