249999999990 has 64 divisors (see below), whose sum is σ = 646247802816. Its totient is φ = 61529513472.

The previous prime is 249999999973. The next prime is 250000000007. The reversal of 249999999990 is 99999999942.

It is an interprime number because it is at equal distance from previous prime (249999999973) and next prime (250000000007).

It is a junction number, because it is equal to n+sod(n) for n = 249999999897 and 249999999906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2873164 + ... + 2958896.

It is an arithmetic number, because the mean of its divisors is an integer number (10097621919).

Almost surely, 2^249999999990 is an apocalyptic number.

249999999990 is an abundant number, since it is smaller than the sum of its proper divisors (396247802826).

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

249999999990 is a wasteful number, since it uses less digits than its factorization.

249999999990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93233.

The product of its (nonzero) digits is 3099363912, while the sum is 87.

The spelling of 249999999990 in words is "two hundred forty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety".