1015725690 has 256 divisors, whose sum is σ = 3320663040. Its totient is φ = 215654400.

The previous prime is 1015725679. The next prime is 1015725709. The reversal of 1015725690 is 965275101.

1015725690 is a `hidden beast` number, since 10 + 15 + 72 + 569 + 0 = 666.

It is a super-2 number, since 2×1015725690² = 2063397354651952200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3244974 + ... + 3245286.

It is an arithmetic number, because the mean of its divisors is an integer number (12971340).

Almost surely, 2^1015725690 is an apocalyptic number.

1015725690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1015725690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660331520).

1015725690 is an abundant number, since it is smaller than the sum of its proper divisors (2304937350).

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

1015725690 is a wasteful number, since it uses less digits than its factorization.

1015725690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 1015725690 is about 31870.4516754940. The cubic root of 1015725690 is about 1005.2146567548.

The spelling of 1015725690 in words is "one billion, fifteen million, seven hundred twenty-five thousand, six hundred ninety".