815555040 has 48 divisors (see below), whose sum is σ = 2568999888. Its totient is φ = 217481216.

The previous prime is 815555033. The next prime is 815555057. The reversal of 815555040 is 40555518.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 815554992 and 815555010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 849057 + ... + 850016.

It is an arithmetic number, because the mean of its divisors is an integer number (53520831).

Almost surely, 2^815555040 is an apocalyptic number.

815555040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

815555040 is an abundant number, since it is smaller than the sum of its proper divisors (1753444848).

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

815555040 is a wasteful number, since it uses less digits than its factorization.

815555040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1699091 (or 1699083 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 33.

The square root of 815555040 is about 28557.9242943180. The cubic root of 815555040 is about 934.2958618970.

The spelling of 815555040 in words is "eight hundred fifteen million, five hundred fifty-five thousand, forty".