698615640 has 48 divisors (see below), whose sum is σ = 2270502000. Its totient is φ = 186297408.

The previous prime is 698615591. The next prime is 698615641. The reversal of 698615640 is 46516896.

698615640 is a `hidden beast` number, since 6 + 9 + 86 + 1 + 564 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (698615641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 969940 + ... + 970659.

It is an arithmetic number, because the mean of its divisors is an integer number (47302125).

Almost surely, 2^698615640 is an apocalyptic number.

698615640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

698615640 is an abundant number, since it is smaller than the sum of its proper divisors (1571886360).

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

698615640 is a wasteful number, since it uses less digits than its factorization.

698615640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940616 (or 1940609 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 698615640 is about 26431.3382181077. The cubic root of 698615640 is about 887.3182922315.

The spelling of 698615640 in words is "six hundred ninety-eight million, six hundred fifteen thousand, six hundred forty".