25415406990 has 128 divisors (see below), whose sum is σ = 69234048000. Its totient is φ = 6632523648.

The previous prime is 25415406977. The next prime is 25415407001. The reversal of 25415406990 is 9960451452.

25415406990 is a `hidden beast` number, since 2 + 5 + 41 + 540 + 69 + 9 + 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 an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3644487 + ... + 3651453.

It is an arithmetic number, because the mean of its divisors is an integer number (540891000).

Almost surely, 2^25415406990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25415406990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34617024000).

25415406990 is an abundant number, since it is smaller than the sum of its proper divisors (43818641010).

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

25415406990 is a wasteful number, since it uses less digits than its factorization.

25415406990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7271 (or 7265 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The spelling of 25415406990 in words is "twenty-five billion, four hundred fifteen million, four hundred six thousand, nine hundred ninety".