1657420490 has 48 divisors (see below), whose sum is σ = 3359308680. Its totient is φ = 587980800.

The previous prime is 1657420451. The next prime is 1657420493. The reversal of 1657420490 is 940247561.

It can be written as a sum of positive squares in 4 ways, for example, as 589372729 + 1068047761 = 24277^2 + 32681^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1657420493) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32906 + ... + 66314.

Almost surely, 2^1657420490 is an apocalyptic number.

1657420490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1657420490 is an abundant number, since it is smaller than the sum of its proper divisors (1701888190).

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

1657420490 is a wasteful number, since it uses less digits than its factorization.

1657420490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33479 (or 33468 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1657420490 is about 40711.4294762540. The cubic root of 1657420490 is about 1183.4345235603.

The spelling of 1657420490 in words is "one billion, six hundred fifty-seven million, four hundred twenty thousand, four hundred ninety".