787216638 has 32 divisors (see below), whose sum is σ = 1700721792. Its totient is φ = 241480800.

The previous prime is 787216627. The next prime is 787216657. The reversal of 787216638 is 836612787.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10573 + ... + 41063.

It is an arithmetic number, because the mean of its divisors is an integer number (53147556).

Almost surely, 2^787216638 is an apocalyptic number.

787216638 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

787216638 is an abundant number, since it is smaller than the sum of its proper divisors (913505154).

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

787216638 is a wasteful number, since it uses less digits than its factorization.

787216638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30840.

The product of its digits is 677376, while the sum is 48.

The square root of 787216638 is about 28057.3811678852. The cubic root of 787216638 is about 923.3466009930.

The spelling of 787216638 in words is "seven hundred eighty-seven million, two hundred sixteen thousand, six hundred thirty-eight".