90907987855902 has 64 divisors (see below), whose sum is σ = 220022303823360. Its totient is φ = 24444768301056.

The previous prime is 90907987855901. The next prime is 90907987855903. The reversal of 90907987855902 is 20955878970909.

It is an interprime number because it is at equal distance from previous prime (90907987855901) and next prime (90907987855903).

It is a super-2 number, since 2×90907987855902² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90907987855901) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13476174 + ... + 19063662.

It is an arithmetic number, because the mean of its divisors is an integer number (3437848497240).

Almost surely, 2^{90907987855902} is an apocalyptic number.

90907987855902 is an abundant number, since it is smaller than the sum of its proper divisors (129114315967458).

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

90907987855902 is a wasteful number, since it uses less digits than its factorization.

90907987855902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5610305.

The product of its (nonzero) digits is 1028764800, while the sum is 78.

The spelling of 90907987855902 in words is "ninety trillion, nine hundred seven billion, nine hundred eighty-seven million, eight hundred fifty-five thousand, nine hundred two".