77640954 has 16 divisors (see below), whose sum is σ = 163454880. Its totient is φ = 24518160.

The previous prime is 77640947. The next prime is 77640961. The reversal of 77640954 is 45904677.

77640954 = 973² + 974² + ... + 1048².

It is an interprime number because it is at equal distance from previous prime (77640947) and next prime (77640961).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340417 + ... + 340644.

It is an arithmetic number, because the mean of its divisors is an integer number (10215930).

Almost surely, 2^77640954 is an apocalyptic number.

77640954 is an abundant number, since it is smaller than the sum of its proper divisors (85813926).

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

77640954 is a wasteful number, since it uses less digits than its factorization.

77640954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681085.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 77640954 is about 8811.4104432832. The cubic root of 77640954 is about 426.6092694871.

The spelling of 77640954 in words is "seventy-seven million, six hundred forty thousand, nine hundred fifty-four".