698557442 has 18 divisors (see below), whose sum is σ = 1152432099. Its totient is φ = 317339220.

The previous prime is 698557429. The next prime is 698557471. The reversal of 698557442 is 244755896.

It can be written as a sum of positive squares in only one way, i.e., 349278721 + 349278721 = 18689^2 + 18689^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18689.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 410309 + ... + 412007.

Almost surely, 2^698557442 is an apocalyptic number.

698557442 is a deficient number, since it is larger than the sum of its proper divisors (453874657).

698557442 is an equidigital number, since it uses as much as digits as its factorization.

698557442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3422 (or 1712 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 50.

The square root of 698557442 is about 26430.2372671908. The cubic root of 698557442 is about 887.2936522716.

Multiplying 698557442 by its sum of digits (50), we get a square (34927872100 = 186890²).

The spelling of 698557442 in words is "six hundred ninety-eight million, five hundred fifty-seven thousand, four hundred forty-two".