90777870 has 48 divisors (see below), whose sum is σ = 240488352. Its totient is φ = 23749440.

The previous prime is 90777857. The next prime is 90777887. The reversal of 90777870 is 7877709.

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 23 ways as a sum of consecutive naturals, for example, 4746 + ... + 14285.

It is an arithmetic number, because the mean of its divisors is an integer number (5010174).

Almost surely, 2^90777870 is an apocalyptic number.

90777870 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

90777870 is an abundant number, since it is smaller than the sum of its proper divisors (149710482).

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

90777870 is a wasteful number, since it uses less digits than its factorization.

90777870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19097 (or 19094 counting only the distinct ones).

The product of its (nonzero) digits is 172872, while the sum is 45.

The square root of 90777870 is about 9527.7421249738. The cubic root of 90777870 is about 449.4278654833.

The spelling of 90777870 in words is "ninety million, seven hundred seventy-seven thousand, eight hundred seventy".