26251904640 has 128 divisors (see below), whose sum is σ = 90114796800. Its totient is φ = 6462001152.

The previous prime is 26251904633. The next prime is 26251904647. The reversal of 26251904640 is 4640915262.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (26251904633) and next prime (26251904647).

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (26251904647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500920 + ... + 550839.

It is an arithmetic number, because the mean of its divisors is an integer number (704021850).

Almost surely, 2^26251904640 is an apocalyptic number.

26251904640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26251904640 is an abundant number, since it is smaller than the sum of its proper divisors (63862892160).

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

26251904640 is a wasteful number, since it uses less digits than its factorization.

26251904640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1051794 (or 1051782 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 26251904640 in words is "twenty-six billion, two hundred fifty-one million, nine hundred four thousand, six hundred forty".